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A
Å
->
angstrom
AAO
->
Anglo-Australian Observatory
AAS
->
American Astronomical Society
AAT
->
Anglo-Australian Telescope
AAVSO
->
American Association of Variable Star Observers
A band
Abell Catalogue
Abell cluster
Abell radius
constant of aberration
->
annual aberration
optical aberration
aberration of starlight
ablation
ablation age
absolute magnitude
1
2
absolute temperature
->
thermodynamic temperature
absolute zero
absorption
absorption coefficient
absorption edge
absorption line
absorption nebula
->
dark nebula
absorption spectrum
abundance
->
abundance of elements
Acamar
acceleration of free fall
accretion
accretion disk
ACE
->
Advanced Composition Explorer
Achernar
Achilles
achondrite
achromatic
achromatism
A-class asteroid
acronical
Acrux
->
Alpha Crucis
active galactic nucleus
active optics
active prominence
active region
John Couch Adams
Walter Sydney Adams
Adams Ring
adaptive optics
Adhara
adiabatic process
Adonis
Adrastea (moon)
ADS
->
Aitken Double Star Catalogue
Advanced Composition Explorer
ACE
advance of perihelion
advection
aeon
aerial
->
antenna
aerobraking
aerolite
->
stony meteorite
aeronomy
aerosol
Ae star
aether
->
ether
afocal
afterglow
AGB star
->
asymptotic giant branch star
Agena
->
Hadar
->
Beta Centauri
agglutinate
AGILE
AGK
AGN
->
active galactic nucleus
Ahnighito meteorite
->
Cape York meteorite
airglow
airmass
air shower
->
cosmic-ray shower
George Biddell Airy
Airy disk
Robert Grant Aitken
Aitken Double Star Catalogue
AI Velorum star
AJ
->
Astronomical Journal
Akari
Albategnius
->
al-Battani
al-Battani
->
Battani
albedo
albedo feature
Albireo
Alcor
Alcyone
Aldebaran
Alderamin
Alexandra family
ALEXIS
Hannes Olof Gösta Alfvén
Alfvén surface
Alfvén wave
Algenib
Algieba
Algol
Algol star
Algonquin Radio Observatory
Alhena
aliasing
alidade
Alioth
Alkaid
Allegheny Observatory
Allende meteorite
Allen Telescope Array
all-sky camera
ALMA
->
Atacama Large Millimeter Array
Almaak
Almagest
almanac
almucantar
Alnair
Alnath
Alnilam
Alnitak
α
->
right ascension
Alpha Capricornid meteors
Alpha Centauri
Alpha Crucis
Alpha Cygnid meteors
Alpha Cygni star
alpha particle
Alphard
Alpha Scorpiid meteors
Alpha2 Canum Venaticorum star
Alphekka
Alpheratz
Alrescha
Alshain
al-Sufi
->
Sufi
Altair
altazimuth mounting
altitude
al-Tusi
->
Tusi
aluminizing
Amalthea
Viktor Amazaspovich Ambartsumian
ambipolar diffusion
AM Canum Venaticorum star
American Association of Variable Star Observers
American Astronomical Society
Ames Research Center
AM Herculis star
Amor group
amplitude
1
2
Am star
anaemic spiral galaxy
analemma
Ananke
anastigmatic
Anaxagoras
Anaximander
Andromeda
Andromeda Galaxy
Andromedid meteors
Anglo-Australian Observatory
Anglo-Australian Telescope
Anders Jonas Ångström
angstrom
angular acceleration
angular diameter
angular distance
->
angular separation
angular momentum
angular resolution
angular separation
angular velocity
anisotropy
Ankaa
annealing
annual aberration
annual equation
annual inequality
->
annual equation
annual parallax
annual variation
annular eclipse
anomalistic month
anomalistic year
anomalous Cepheid
anomalous iron
anomaly
anorthosite
ANS
->
Astronomical Netherlands Satellite
ansa
ansae
antapex
->
solar apex
Antares
antenna
Antennae
antenna pattern
antenna temperature
anthelion
anthelion radiant
anthropic principle
anticentre
->
galactic anticentre
anti-dwarf nova
antimatter
antitail
Antlia
Eugène Michael Antoniadi
Antoniadi scale
Antu
ap-
apo-
Apache Point Observatory
apastron
aperture
aperture efficiency
aperture ratio
aperture synthesis
APEX
->
Atacama Pathfinder Experiment
apex
->
solar apex
aphelion
Aphrodite Terra
ApJ
->
Astrophysical Journal
aplanatic
apoapsis
apocentre
apochromatic
apodization
apogee
apohele
Apollo group
Apollonius of Perga
Apollo project
apparent diameter
->
angular diameter
apparent magnitude
apparent noon
apparent place
apparent retrogression
apparent sidereal time
apparent solar time
apparition
appulse
apse
->
apsides
apsis
->
apsides
apsidal motion
apsides
Ap star
Apus
Aquarid meteors
Aquarius
aqueous alteration
Aquila
Ara
arachnoid
François Arago
Dominique François Jean Arago
Arago ring
arc
archaeoastronomy
arch filament system
arc minute
->
minute of arc
arcmin
->
minute of arc
arc second
->
second of arc
arcsec
->
second of arc
Arcturus
arcus
area photometer
Arecibo Observatory
Comet Arend–Roland (C/1956 R1)
areo-
Friedrich Wilhelm August Argelander
Argelander step method
Argo Navis
argon–potassium method
->
potassium–argon method
argument of perihelion
Argyre Planitia
Ariel
Ariel satellites
Aries
first point of Aries
Aristarchos Telescope
Aristarchus of Samos
Aristotle
Arizona meteor crater
->
meteor crater
Arizona Radio Observatory
ARO
AR Lacertae star
armillary sphere
arm population
Arneb
array
1
2
artificial satellite
ASCA
ascending node
Asclepius
ashen light
ASP
->
Astronomical Society of the Pacific
aspect
aspheric
stellar association
Association of Universities for Research in Astronomy
AURA
A star
asterism
asteroid
asteroid belt
asteroseismology
asthenosphere
astigmatism
Astraea
astration
astrobiology
astrobleme
astrochemistry
astrodynamics
astrograph
Astrographic Catalogue
astrolabe
astrology
astrometric binary
astrometry
astronavigation
Astronomer Royal
Astronomer Royal for Scotland
The Astronomical Almanac
Astronomical Journal
AJ
Astronomical Netherlands Satellite
ANS
Astronomical Society of the Pacific
ASP
astronomical triangle
astronomical twilight
astronomical unit
AU
astronomy
Astronomy and Astrophysics
A&A
->
Astronomy and Astrophysics
astrophotography
Astrophysical Journal
astrophysics
ASTROSAT
astrum
Asuka
->
ASCA
asymptotic giant branch star
AGB star
Atacama Large Millimeter Array
ALMA
Atacama Pathfinder Experiment
APEX
ataxite
Aten group
Atlas
atmosphere
atmospheric extinction
atmospheric refraction
atmospheric scattering
->
atmospheric extinction
->
Mie scattering
->
Rayleigh scattering
atmospheric window
ATNF
->
Australia Telescope National Facility
atom
atomic clock
atomic time
Atria
attenuation
1
2
AU
->
astronomical unit
aubrite
Auger shower
->
cosmic-ray shower
augmentation
AURA
->
Association of Universities for Research in Astronomy
Auriga
Aurora programme
aurora
auroral oval
auroral substorm
->
substorm
Australia Telescope National Facility
ATNF
australite
autocorrelation
autocorrelator
autoguider
autoionization
autumnal equinox
->
equinox
averted vision
Avior
axion
optical axis
axis of rotation
azimuth
Azophi
->
al-Sufi
B
BAA
->
British Astronomical Association
Wilhelm Heinrich Walter Baade
Walter Baade
Baade's Window
Baade–Wesselink method
Harold Delos Babcock
Horace Welcome Babcock
background noise
background radiation
backscattering
Bailey type
Francis Baily
Baily's beads
Baker–Schmidt telescope
Baldwin effect
Balmer limit
Balmer lines
->
Balmer series
Balmer series
band
bandpass filter
bandwidth
bar
barium star
Barlow lens
Edward Emerson Barnard
Barnard's Loop
Barnard's Star
barn-door mount
->
Scotch mount
Barnes–Evans relationship
barred spiral galaxy
barrel distortion
Barringer Crater
->
meteor crater
barycentre
Barycentric Celestial Reference System
barycentric coordinates
Barycentric Coordinate Time
Barycentric Dynamical Time
baryon
baryon star
basalt
basaltic achondrite
baseline
impact basin
Muammad ibn Jabir al-Battani
Ba II star
->
barium star
Bautz–Morgan class
Johann Bayer
Bayer letters
B band
B-class asteroid
BCRS
->
Barycentric Celestial Reference System
BD
->
Bonner Durchmusterung
Beagle
beam
beaming
beamwidth
beat Cepheid
Becklin–Neugebauer Object (BN Object)
Becrux
->
Beta Crucis
bediasite
Beehive Cluster
->
Praesepe
Belinda
Bellatrix
Susan Jocelyn Bell Burnell
Jocelyn Bell Burnell
Belt of Orion
Benetnasch
->
Alkaid
Comet Bennett (C/1969 Y1)
bent-pillar mounting
BepiColombo
BeppoSAX
Berkeley–Illinois–Maryland Association Array (BIMA Array)
Friedrich Wilhelm Bessel
Besselian day numbers
Besselian elements
Besselian epoch
Besselian year
Be star
B(e) star
Beta Canis Majoris star
->
Beta Cephei star
Beta Cephei star
Beta Crucis
beta decay
Beta Lyrae star
beta particle
Beta Persei star
->
Algol star
Beta Pictoris
Beta Regio
Beta Taurid meteors
Betelgeuse
Hans Albrecht Bethe
Bethe–Weizsäcker cycle
->
carbon–nitrogen cycle
Bianca
Bianchi cosmology
biconcave lens
biconvex lens
Comet 3D/Biela
Bielid meteors
->
Andromedid meteors
Big Bang theory
Big Bear Solar Observatory
Big Crunch
Big Dipper
billitonite
BIMA Array
binary galaxy
binary pulsar
binary star
binding energy
binoculars
Jean-Baptiste Biot
bipolar group
bipolar nebula
bipolar outflow
birefringent filter
Birmingham Solar Oscillations Network
BiSON
->
Birmingham Solar Oscillations Network
black body
black-body radiation
black drop
black dwarf
Black Eye Galaxy
black hole
Black Widow Pulsar
->
binary pulsar
blazar
Blaze Star
Blazhko effect
BL Herculis star
blink comparator
Blinking Planetary
BL Lacertae object
BL Lac object
bloomed lens
blooming
1
2
blue clearing
blue compact dwarf galaxy
blue giant
blue Moon
1
2
Blue Planetary
blue populous cluster
->
Large Magellanic Cloud
blueshift
blue straggler
B magnitude
BN Object
->
Becklin–Neugebauer Object
Johann Elert Bode
Bode's law
Bartholomeus Jan Bok
Bartholomeus 'Bart' Jan Bok
Bok globule
->
globule
bolide
bolometer
bolometric correction
bolometric magnitude
Boltzmann constant
George Phillips Bond
William Cranch Bond
Bond albedo
Hermann Bondi
Bonner Durchmusterung
Boötes
boson
Boss General Catalogue
GC
boundary layer
bound–bound transition
bound–free transition
Bouwers telescope
Ira Sprague Bowen
Bowen fluorescence
bow shock
Bp star
Brackett series
James Bradley
Bragg crystal spectrometer
Tycho Brahe
Brans–Dicke theory
breccia
bremsstrahlung
bridge (astronomy)
bright nebula
brightness temperature
Bright Star Catalogue
British Astronomical Association
broad-band photometry
Brocchi's Cluster
Comet 16P/Brooks 2
->
Jupiter comet family
Ernest William Brown
brown dwarf
B star
Bubble Nebula
Budrosa family
Bug Nebula
bump Cepheid
Geoffrey Ronald Burbidge
Eleanor Margaret Burbidge
burst (astronomy)
Butcher–Oemler effect
Butler matrix
Butterfly Cluster
butterfly diagram
Butterfly Nebula
BV photometry
Bw star
BY Draconis star
Byurakan Astrophysical Observatory
C
Caelum
Calar Alto Observatory
caldera
calendar
calendar year
Caliban
California Nebula
Callippus
Callisto
Caloris Basin
Caltech Submillimeter Observatory
CSO
Calypso (moon)
Cambridge Optical Aperture Synthesis Telescope
COAST
Camelopardalis
William Wallace Campbell
Canada–France–Hawaii Telescope
canale
canali
Martian canals
Cancer
Tropic of Cancer
Canes Venatici
Canis Major
Canis Minor
Annie Jump Cannon
Canopus
cantaloupe terrain
Capella
Cape Photographic Durchmusterung
Cape photometry
Cape RI photometry
->
Kron–Cousins RI photometry
Cape York meteorite
Caph
Tropic of Capricorn
Capricornid meteors
Capricornus
captured rotation
->
synchronous rotation
Carafe Galaxy
carbonaceous chondrite
carbon burning
carbon cycle
->
carbon–nitrogen cycle
carbon flash
carbon–nitrogen cycle (CN cycle)
carbon star
Carina
Carina Arm
Carina Dwarf Galaxy
Carina–Sagittarius Arm
CARMA
->
Combined Array for Research in Millimeter-wave Astronomy
Carme
Carnegie Observatories
Carpo
Richard Christopher Carrington
Carrington heliographic coordinates
Carrington rotation
Carte du Ciel
Cartesian coordinates
Cartwheel Galaxy
Cassegrain telescope
Cassini
Giovanni Domenico Cassini
Jacques Cassini
Cassini Division
Cassini–Huygens
Cassiopeia
Cassiopeia A
Castalia
Castor
cataclysmic binary
cataclysmic variable
catadioptric system
Catalina Sky Survey
catalogue equinox
catena
catoptric system
Cat's Eye Nebula
cavus
CCD
->
charge-coupled device
CCD spectrometer
C-class asteroid
cD Galaxy
CDM
->
cold dark matter
CDS
->
Centre de Données astronomiques de Strasbourg
celestial axis
celestial coordinates
celestial equator
Celestial Intermediate Reference System
celestial latitude
celestial longitude
celestial mechanics
celestial meridian
celestial pole
celestial sphere
Centaur group
Centaurus
Centaurus A
Center for Astrophysics
Central Bureau for Astronomical Telegrams
central meridian
central peak
Centre de Données astronomiques de Strasbourg
centre of gravity
centre of inertia
centre of mass
centrifugal force
centripetal force
Cepheid instability strip
Cepheid variable
Cepheus
Cerenkov counter
Cerenkov radiation
Ceres
Cerro Pachón
Cerro Paranal
Cerro Tololo Inter-American Observatory
Cetus
CfA
->
Harvard–Smithsonian Center for Astrophysics
CGRO
->
Compton Gamma Ray Observatory
Chamaeleon
Chandler period
Chandler wobble
Subrahmanyan Chandrasekhar
Chandrasekhar limit
Chandrasekhar-Schönberg limit
Chandra X-ray Observatory
Chandrayaan-1
Chang'e
chaos
chaotic orbit
chaotic terrain
CHARA Array
charge
charge-coupled device
Charon
chasma
chassignite
chemical element
chemosphere
Chicxulub
CHIPSat
Chiron
Ernst Florens Friedrich Chladni
chondrite
chondrule
chopper
chopping secondary
William Henry Mahoney Christie
chromatic aberration
chromosphere
chromospheric network
Chryse Planitia
CH star
Circinus
Circlet
circular velocity
circumpolar
circumstellar maser
circumstellar matter
Cirrus Nebula
->
Veil Nebula
CIRS
->
Celestial Intermediate Reference System
cislunar
civil time
civil twilight
civil year
Alexis Claude Clairaut
Alvan Clark
classical Cepheid
clast
clathrate
CLEAN
Clementine
James Clerk Maxwell
C line
clock drive
->
drive
clock star
closed universe
Clown Face Nebula
->
Eskimo Nebula
Cluster
star cluster
->
globular cluster
star cluster
->
open cluster
cluster, star
->
star cluster
cluster of galaxies
cluster variable
->
RR Lyrae star
CMB
->
cosmic microwave background
CME
->
coronal mass ejection
CM relation
->
colour–magnitude relation
CN band
CN cycle
->
carbon–nitrogen cycle
CNO cycle
->
carbon–nitrogen–oxygen cycle
CN star
Coalsack
coaltitude
COAST
Coathanger
COBE
Cocoon Nebula
cocoon star
CoD
->
Córdoba Durchmusterung
coded mask
coelostat
coesite
coherence
coherence bandwidth
colatitude
cold camera
cold dark matter
collapsar
colles
collimation
collimation error
collimator
Colombo Gap
colorimetry
->
colour index
colour
->
colour index
colour excess
colour index
colour–luminosity relation
->
colour–magnitude relation
colour–magnitude relation
colour temperature
Columba
column density
colure
cometary coma
optical coma
Coma Berenices
Coma Cluster
Coma Star Cluster
Coma–Virgo Cluster
->
Virgo Cluster
Combined Array for Research in Millimeter-wave Astronomy
combined magnitude
comes
comet
cometary globule
comet family
comet-seeker
commensurability
Andrew Ainslie Common
common envelope binary
common proper motion
compact galaxy
compact object
compact source
comparator
comparison spectrum
composite-spectrum binary
Compton effect
Compton Gamma Ray Observatory
Compton–Getting effect
Compton scattering
->
Compton effect
Compton upscattering
->
inverse Compton scattering
Concordia family
Cone Nebula
confusion
conic section
conjunction
constant of aberration
->
annual aberration
constellation
constructive interference
->
interference
contact binary
continuous creation
continuous spectrum
continuum
stellar convection
convective envelope
convective equilibrium
convective overshoot
->
overshooting
convective zone
convergent point
converging lens
convolution
Thomas Cooke
cooled camera
->
cold camera
cooling flow
coorbital
Coordinated Universal Time
coordinate systems
->
celestial coordinates
coordinate time
Copernican system
Nicolaus Copernicus
Copernicus satellite
Coprates
Cor Caroli
Cordelia
Córdoba Durchmusterung
planetary core
stellar core
core collapse
1
2
Coriolis force
corona
1
2
3
Corona Australis
Corona Borealis
coronagraph
coronal bright point
coronal condensation
coronal hole
coronal lines
coronal loop
coronal mass ejection
coronal plume
coronal rain
COROT
co-rotation
corpuscular radiation
1
2
corrector plate
correlation detection
correlation function
correlation receiver
correlator
Corvus
COS-B
cosmic abundance
Cosmic Background Explorer
cosmic background radiation
->
cosmic microwave background
CBR
->
cosmic background radiation
cosmic censorship
cosmic dust
cosmic microwave background
cosmic rays
cosmic-ray shower
cosmic scale factor
cosmic string
cosmic texture
cosmic year
cosmochemistry
->
astrochemistry
cosmological constant
cosmological distance scale
cosmological principle
cosmology
cosmos
Cosmos satellites
COSPAR
coudé focus
Couder telescope
counterglow
->
gegenschein
Philip Herbert Cowell
c.p.m.
->
common proper motion
Crab Nebula
Crab Pulsar
Crater
crater
crater chain
crater counting
crêpe ring
crepuscular rays
crescent
Cressida
Crimean Astrophysical Observatory
critical density
Andrew Claude de la Cherois Crommelin
cross-axis mounting
crossing time
cross-wire micrometer
crown glass
crust
Crux
cryostat
cryovolcanism
C star
CTIO
->
Cerro Tololo Inter-American Observatory
Cubewano
culmination
curvature of field
curvature of space
->
curvature of spacetime
curvature of spacetime
curvature radiation
curve of growth
cusp
cusp gap
Cybele group
cyclotron maser
cyclotron radiation
Cygnus
Cygnus A
Cygnus Loop
Cygnus Rift
Cygnus X-1
Cynthian
Cytherean
D
Dactyl
Dall–Kirkham telescope
Damocles
Damocloid
André Danjon
Danjon astrolabe
Danjon scale
dark adaptation
dark energy
dark galaxy
dark matter
dark nebula
daughter isotope
Davida
David Dunlap Observatory
Raymond Davis, Jr
William Rutter Dawes
Dawes limit
Dawn
day
Daylight Saving Time
->
Summer Time
day number
1
2
D-class asteroid
DCT
->
Discovery Channel Telescope
DDO classification
DDO photometry
dec.
->
declination
deceleration parameter
Comet de Chéseaux (C/1743 X1)
declination
declination axis
deconvolution
decoupling
dedispersion
Deep Impact
deep-sky object
Deep Space Network
Deep Space 1
defect of illumination
deferent
deflection of light
degeneracy
degenerate star
degree of arc
degrees of freedom
Deimos
delay line
Delphinus
δ
->
declination
delta
->
declination
Delta Aquarid meteors
Delta Cepheid star
->
classical Cepheid
Delta Delphini star
Delta Scuti star
delta T
ΔT
Demon Star
Deneb
Deneb Kaitos
Denebola
William Frederick Denning
density parameter
density wave
descending node
Desdemona
Willem de Sitter
de Sitter universe
Despina
destructive interference
->
interference
detached binary
deuterium
Gérard Henri de Vaucouleurs
dewar
dew cap
D galaxy
diagonal
diamond ring
Diana Chasma
dichotomy
dichroic mirror
Robert Henry Dicke
Dicke radiometer
Dicke switch
dielectronic recombination
differential rotation
differentiation
diffraction
diffraction grating
diffraction-limited
diffraction pattern
diffraction rings
diffuse interstellar bands
diffuse nebula
diogenite
Dione
dioptric system
Diphda
->
Deneb Kaitos
dipole
1
2
3
dipole antenna
Dirac cosmology
directivity
direct motion
dirty snowball
disconnection event
Discovery Channel Telescope
Discovery Program
dish antennae
disk galaxy
disk population
disparition brusque
->
filament
dispersion
1
2
dispersion measure
distance modulus
distortion
diurnal
diurnal aberration
diurnal inequality
diurnal libration
diurnal motion
diurnal parallax
diverging lens
D layer
D lines
dMe star
Dobsonian telescope
Dog Star
John Dollond
domain wall
dome
Dominion Astrophysical Observatory
Dominion Radio Astrophysical Observatory
Comet Donati (C/1858 L1)
Christian Johann Doppler
Doppler broadening
Doppler effect
->
Doppler shift
dopplergram
Doppler shift
Dorado
dorsum
Double Cluster
Double Double
double-lined binary
double-mode variable
double pulsar
double quasar
double star
doublet
1
2
DQ Herculis star
Draco
draconic month
Draconid meteors
->
Giacobinid meteors
Drake equation
Henry Draper
Draper
drawtube
Johan Ludvig Emil Dreyer
drifting sub-pulse
drift scan
drive
D star
Dubhe
Dumbbell Nebula
dust
dust tail
->
cometary tail
duty cycle
dwarf Cepheid
dwarf galaxy
dwarf nova
dwarf planet
dwarf spheroidal galaxy
dwarf star
dwarf variable
Dwingeloo galaxy
Dwingeloo Radio Observatory
dynamical equinox
dynamical friction
dynamical parallax
dynamical time
dynamo
Frank Watson Dyson
E
Eagle Nebula
early-type galaxy
early-type star
Earth
Earth coorbital asteroid
->
Apollo group
->
Aten group
Earth-crossing asteroid
->
Amor group
Earth-approaching asteroid
earthlight
->
earthshine
eccentric anomaly
eccentricity
echelle grating
echelle spectrograph
E-class asteroid
eclipse
eclipse season
eclipse year
eclipsing binary
ecliptic
ecliptic coordinates
ecliptic latitude
ecliptic limits
ecliptic longitude
ecliptic pole
E corona
Arthur Stanley Eddington
Eddington limit
Edgeworth–Kuiper Belt
->
Kuiper Belt
E-ELT
->
European Extremely Large Telescope
effective aperture
effective area
effective focal length
effective temperature
Effelsberg Radio Observatory
Egg Nebula
Albert Einstein
Einstein coefficient
Einstein Cross
Einstein–de Sitter universe
Einstein Observatory
Einstein ring
Einstein shift
->
gravitational redshift
ejecta
Elara
E layer
electromagnetic radiation
electromagnetic spectrum
electron
electron degeneracy
electron density
electron scattering opacity
electron temperature
electronvolt
chemical element
optical element
elementary particle
abundance of elements
orbital elements
E line
Ellerman bomb
ellipse
ellipsoid
ellipsoidal variable
elliptic aberration
->
E-terms
elliptical galaxy
ellipticity
->
oblateness
Elnath
->
Alnath
elongation
1
2
Eltanin
->
Etamin
Elysium Planitia
emersion
emission
emission line
emission nebula
emission spectrum
emissivity
photographic emulsion
Enceladus
Comet 2P/Encke
Johann Franz Encke
Encke Division
energy level
English mounting
Enif
Ensisheim meteorite
enstatite chondrite
entrainment
entropy
envelope (astronomy)
eon
->
aeon
Eos family
epact
Ep galaxy
ephemeris
Ephemeris Time
epicycle
Epimetheus
epoch
e-process
Epsilon Aurigae
equant
equation (astronomy)
equation of light
equation of the centre
equation of the equinoxes
equation of the origins
equation of time
equator
equatorial bulge
equatorial coordinates
equatorial horizontal parallax
equatorial mounting
equinoctial colure
equinox
equipotential surface
equivalence principle
equivalent focal length
equivalent width
Equuleus
ERA
->
Earth rotation angle
Eratosthenes
Erfle eyepiece
ergosphere
Eridanus
Eris
Eros
eruptive binary
eruptive prominence
eruptive variable
ESA
->
European Space Agency
escape velocity
Eskimo Nebula
ESO
->
European Southern Observatory
ET
->
Ephemeris Time
Eta Aquarid meteors
Eta Carinae
Eta Carinae Nebula
etalon
Etamin
E-terms
ether
eucrite
Eudoxus of Cnidus
Leonhard Euler
Eunomia family
Europa
European Extremely Large Telescope
European Southern Observatory
European Space Agency
European VLBI Network
EUV
->
extreme ultraviolet
EUVE
->
Extreme Ultraviolet Explorer
eV
->
electronvolt
evection
evening star
event horizon
Evershed effect
EVN
->
European VLBI Network
evolved star
excitation
excitation temperature
exit cone
exit pupil
EX Lupi star
exobiology
->
astrobiology
ExoMars
exoplanet
->
extrasolar planet
EXor
->
EX Lupi star
Exosat
exosphere
expanding universe
Explorer
exposure age
extended source
1
2
atmospheric extinction
interstellar extinction
extragalactic nebula
->
galaxy
extrasolar planet
extreme Population I star
extreme ultraviolet
Extreme Ultraviolet Explorer
extrinsic variable
eye lens
eyepiece
eye relief
F
Faber–Jackson relation
David Fabricius
Johann Fabricius
Johannes Fabricius
Fabry lens
Fabry–Perot interferometer
facula
1
2
fall
falling star
->
meteor
False Cross
Fanaroff–Riley class
fan beam
Faraday effect
far infrared
farrum
far ultraviolet
Far Ultraviolet Spectroscopic Explorer
Fast Auroral Snapshot Explorer
fast nova
Faulkes Telescopes
fault
F band
F-class asteroid
F corona
feed
fermion
fibrille
field curvature
->
curvature of field
field equations
field flattener
field lens
field of view
field star
field stop
53 Persei star
figure
filament
1
2
filamentary nebula
filar micrometer
filigree
filled aperture
filled-centre supernova remnant
->
plerion
filter
1
2
filtergram
find
finder
fine structure
fireball
first contact
first point of Aries
first point of Libra
first quarter
Fish Mouth
fission
fission track
Fitzgerald contraction
->
Lorentz–Fitzgerald contraction
fixed stars
FK
FK Comae Berenices star
John Flamsteed
Flamsteed numbers
solar flare
flare star
flash spectrum
flash star
flat
polar flattening
F layer
Williamina Paton Fleming
flexus
flickering
flint glass
flocculi
1
->
mottles
2
->
plages
Flora group
fluctus
flumen
fluorescence
fluorite
flux
flux collector
flux density
1
2
flux tube
flux unit
f/number
focal distance
focal length
focal plane
focal point
focal ratio
focal reducer
focal surface
optical focus
orbital focus
Fokker–Planck equation
folded dipole
following
Fomalhaut
footpoint
->
coronal loop
forbidden line
Forbush effect
fork mounting
Fornax
Fornax A
Fornax Dwarf Galaxy
47 Tucanae
forward scattering
fossa
Foucault test
four-colour photometry
->
Strömgren photometry
Fourier analysis
Fourier transform
Fourier transform spectrometer
fourth contact
William Alfred Fowler
Fp star
fractional method
frame dragging
frame of reference
Franklin-Adams charts
Joseph von Fraunhofer
Fraunhofer lines
Fred Lawrence Whipple Observatory
free–bound transition
free–free transition
frequency
frequency analysis
->
Fourier analysis
Friedmann universe
fringe
->
interference pattern
fringe pattern
f-spot
F star
FTS
->
Fourier transform spectroscopy
full Moon
full-wave dipole
full width at half maximum
fundamental catalogue
fundamental mode
fundamental plane
fundamental star
fuor
->
FU Orionis star
FUSE
->
Far Ultraviolet Spectroscopic Explorer
fusion
fusion crust
future light cone
->
light cone
FWHM
->
full width at half maximum
G
g
->
acceleration of free fall
G
->
gravitational constant
Gacrux
->
Gamma Crucis
Gaia
gain
galactic anticentre
galactic bulge
galactic centre
galactic cluster
galactic coordinates
galactic disk
galactic equator
galactic halo
galactic latitude
galactic longitude
galactic magnetic field
galactic nucleus
galactic plane
galactic pole
galactic rotation
galactic window
galactic year
->
cosmic year
Galatea
Galaxy
galaxy
galaxy cannibalism
galaxy cluster
galaxy encounter
galaxy evolution
Galaxy Evolution Explorer
galaxy formation
galaxy merger
GALEX
->
Galaxy Evolution Explorer
Galilean satellites
Galilean telescope
Galileo
Galileo Galilei
Galileo National Telescope
Galileo Regio
Johann Gottfried Galle
Galle Ring
Gamma Cassiopeiae star
Gamma Crucis
Gamma Doradus star
gamma-ray astronomy
gamma-ray background
gamma-ray burst
Gamma-ray Large Area Space Telescope
gamma rays
gamma-ray telescope
George Gamow
Ganymede
Sergei Illarionovich Gaposchkin
->
Cecilia Payne-Gaposchkin
Garnet Star
gas giant
->
giant planet
Gaspra
gas scintillation proportional counter
gas tail
->
cometary tail
Carl Friedrich Gauss
Gaussian gravitational constant
G band
G-class asteroid
GCRS
->
Geocentric Celestial Reference System
GCVS
->
General Catalogue of Variable Stars
gegenschein
Geminga
Gemini
Geminid meteors
Gemini Observatory
Gemma
->
Alphekka
General Catalogue of Variable Stars
general precession
general theory of relativity
Genesis
Geneva photometry
geo-
geocentric
Geocentric Celestial Reference System
geocentric coordinates
Geocentric Coordinate Time
geocentric equatorial parallax
geocentric parallax
geocorona
geodesic
geodesy
Geographos
geoid
geomagnetic storm
geomagnetism
geometrical albedo
geometrical libration
->
optical libration
georgiaite
geostationary orbit
geosynchronous orbit
geotail
->
magnetotail
germanium detector
German mounting
GHA
ghost crater
Ghost of Jupiter
Riccardo Giacconi
Giacobinid meteors
Comet 21P/Giacobini–Zinner
giant branch
Giant Magellan Telescope
Giant Metrewave Radio Telescope
giant molecular cloud
giant planet
giant star
gibbous
Gienah
David Gill
Ginga
Giotto
GLAST
->
Gamma-ray Large Area Space Telescope
Glauke
glitch
Global Oscillation Network Group
globular cluster
globule
GMAT
->
Greenwich Mean Astronomical Time
GMC
->
giant molecular cloud
GMST
->
Greenwich Mean Sidereal Time
GMT
->
Greenwich Mean Time
GMT
->
Giant Magellan Telescope
gnomon
Goddard Space Flight Center
Gödel universe
Thomas Gold
Goldstone
GONG
->
Global Oscillation Network Group
John Goodricke
GoTo telescope
Benjamin Apthorp Gould
Gould's Belt
graben
interplanetary grains
interstellar grains
Granat
grand unified theory
Gran Telescopio Canarias
granulation
graticule
->
reticle
grating
->
diffraction grating
grating spectrometer
gravitation
gravitational acceleration
gravitational collapse
gravitational constant
gravitational deflection
gravitational energy
gravitational field
gravitational force
gravitational instability
gravitational lens
gravitational mass
gravitational radiation
gravitational wave
graviton
gravity assist
gravity gradient
Gravity Probe B
grazing-incidence telescope
grazing occultation
GRB
->
gamma-ray burst
Great Attractor
Great Bear
->
Ursa Major
great circle
Great Dark Spot
greatest brilliancy
greatest elongation
Great Observatories
Great Red Spot
Great Rift
Great September Comet (C/1882 R1)
Great Wall
Green Bank
Green Bank Telescope
green flash
greenhouse effect
Greenwich hour angle
Greenwich Mean Astronomical Time
Greenwich Mean Sidereal Time
Greenwich Mean Time
Greenwich meridian
Greenwich Observatory
Greenwich sidereal date
Greenwich Sidereal Time
Gregorian calendar
Gregorian telescope
James Gregory
Comet 26P/Grigg–Skjellerup
grism
grooved terrain
Grotrian diagram
ground state
GRS
->
Great Red Spot
Howard Grubb
Grus
GST
->
Greenwich Sidereal Time
G star
GTC
->
Gran Telescopio Canarias
Guardians
guest star
guider
guide star
guide telescope
Gum Nebula
GUT
->
grand unified theory
GW Virginis star
->
ZZ Ceti star
gyrofrequency
gyrosynchrotron radiation
H
HA
->
hour angle
Hadar
Hadley circulation
Hadley Rille
hadron
hadron era
HAEBE
->
Herbig Ae/Be star
Haedi
->
Kids
Haig mount
->
Scotch mount
Hakucho
halation
HALCA
George Ellery Hale
Comet Hale–Bopp (C/1995 01)
Hale Observatories
Hale's law
->
bipolar group
Hale telescope
half-life
half-wave dipole
half-width
->
full width at half maximum
Asaph Hall
Edmond Halley
Halley-family comet
Halley's Comet
atmospheric halo
galactic halo
halo CME
halo orbit
halo population
Hα
Hamal
H and K lines
Hanle effect
hard X-rays
Haro galaxy
Hartebeesthoek Radio Astronomy Observatory
HartRAO
->
Hartebeesthoek Radio Astronomy Observatory
Hartmann test
Haruka
->
HALCA
Harvard classification
Harvard College Observatory
Harvard Revised Photometry
Harvard–Smithsonian Center for Astrophysics
harvest Moon
Hat Creek Radio Observatory
Hathor
Haute-Provence Observatory
Stephen William Hawking
Hawking radiation
Hayabusa
Hayashi track
Haystack Observatory
HCG
->
Hickson compact group
HD Catalogue
->
Henry Draper Catalogue
cometary head
head–tail galaxy
HEAO
->
High Energy Astrophysical Observatory
heat death of the Universe
Heaviside layer
->
E layer
heavy element
heavy-metal star
Hebe
Hektor
Helene
heli-
->
Sun
helio-
->
Sun
heliacal rising and setting
heliocentric
1
2
heliocentric coordinates
heliocentric latitude
heliocentric longitude
heliocentric parallax
->
annular parallax
heliographic coordinates
heliometer
heliopause
helioseismology
heliosheath
heliosphere
Helios probes
heliostat
helium burning
helium flash
helium shell flash
helium star
Helix Nebula
Hellas Planitia
helmet streamer
->
streamer
Helmholtz–Kelvin contraction
hemispherical albedo
Henry Draper Catalogue
Henyey track
Hephaistos
Heraclides of Pontus
Herbig Ae/Be star
Herbig–Haro object
Hercules
Hercules Cluster
Hercules X-1
Herculina
Hermes
Caroline Lucretia Herschel
Karoline Lucretia Herschel
->
Caroline Lucretia Herschel
John Frederick William Herschel
Frederick William Herschel
->
William Herschel
Friedrich Wilhelm Herschel
->
William Herschel
William Herschel
Herschelian telescope
Comet 35P/Herschel–Rigollet
Herschel Space Observatory
Hertha family
->
Nysa family
hertz
Ejnar Hertzsprung
Hertzsprung gap
Hertzsprung–Russell diagram
Victor Francis Hess
HESSI
->
Ramaty High-energy Solar Spectroscopic Imager
HETE-2
->
High Energy Transient Explorer-2
Johannes Hevelius
Antony Hewish
hexahedrite
HH object
->
Herbig–Haro object
Hickson compact group
Hidalgo
hierarchical cosmology
High Energy Astrophysical Observatory
high-energy astrophysics
High-Energy Transient Explorer-2
lunar highlands
high-speed photometry
high-velocity cloud
high-velocity star
Hilda group
George William Hill
Himalia
Hind's Crimson Star
Hind's Variable Nebula
Hinode
Hinotori
Hipparchus of Nicaea
Hipparcos
Hirayama family
Hiten
H line
->
H and K lines
H magnitude
Hoba West meteorite
Hobby–Eberly Telescope
Hohmann orbit
Holmberg radius
homogeneity
homology
Homunculus Nebula
H I region
Hooker Telescope
horizon
horizontal branch
horizontal coordinates
horizontal parallax
horizontal refraction
horn antenna
Horologium
Jeremiah Horrocks
Jeremiah Horrox
->
Jeremiah Horrocks
Horsehead Nebula
horseshoe mounting
Horseshoe Nebula
horseshoe orbit
horst
hot Big Bang
hot dark matter
hot Jupiter
hot spot
1
2
hour angle
hour circle
Hourglass Nebula
howardite
Fred Hoyle
HPBW
->
half-power beamwidth
half-power beamwidth
->
beamwidth
HR diagram
->
Hertzsprung–Russell diagram
HR number
HSO
->
Herschel Space Observatory
HST
->
Hubble Space Telescope
H20 maser
H II region
Edwin Powell Hubble
Hubble classification
Hubble constant
Hubble diagram
Hubble flow
Hubble law
Hubble parameter
->
Hubble constant
Hubble radius
Hubble–Sandage variable
Hubble Space Telescope
Hubble's Variable Nebula
Hubble time
William Huggins
Hendrik ('Henk') Christoffel van de Hulst
Milton Lasell Humason
hummocky terrain
Humphreys series
Hungaria group
hunter's Moon
Huygenian eyepiece
Christiaan Huygens
Huygens Gap
Huygens probe
Hyades
Comet Hyakutake (C/1996 B2)
Hydra
hydrocarbon
hydrogen
hydrogen burning
hydrogen emission region
hydrogen ion
hydrogen line
->
21-centimetre line
hydrogen spectrum
hydrostatic equilibrium
hydroxyl
Hydrus
Hygiea
hyperbola
hyperbolic comet
hyperbolic orbit
hyperbolic velocity
hyperboloid
hyperfine structure
hypergiant star
Hyperion
hypernova
hyperon
hypersensitization
hypersthene achondrite
->
diogenite
hypervelocity impact
Hz
->
hertz
HZ43
I
Iapetus
IAU
->
International Astronomical Union
IC
->
Index Catalogue
Icarus
ICE
->
International Cometary Explorer
ICRF
->
International Celestial Reference Frame
ICRS
->
International Celestial Reference System
Ida
IGM
->
intergalactic medium
igneous
IGY
->
International Geophysical Year
Comet Ikeya–Seki (C/1965 S1)
Comet Ikeya–Zhang (153P/)
illuminance
IMAGE
->
Imager for Magnetopause-to-Aurora Global Exploration
image intensifier
->
image tube
Image Photon Counting System
Imager for Magnetopause-to-Aurora Global Exploration
image tube
imaging photometer
->
area photometer
I magnitude
Imbrium Basin
immersion
impact crater
impactite
impersonal astrolabe
->
Danjon astrolabe
inclination
1
2
Index Catalogue
indochinite
Indus
inequality
inert gas
->
noble gas
inertial coordinate system
inertial mass
inertial reference frame
infall velocity
inferior conjunction
inferior planet
inflationary universe
Infrared Astronomical Satellite
infrared astronomy
infrared cirrus
infrared excess
infrared photometry
infrared radiation
infrared source
Infrared Space Observatory
infrared telescope
infrared window
initial mass function
Robert Thorburn Ayton Innes
Innisfree meteorite
insolation
instability strip
Institut de Radio Astronomie Millimétrique
INT
->
Isaac Newton Telescope
INTEGRAL
->
International Gamma-Ray Astrophysics Laboratory
integrated magnitude
integration time
intensity
intensity interferometer
interacting binary
interacting galaxy
Interamnia
interference
1
2
interference filter
interference pattern
interferometer
intergalactic absorption
intergalactic magnetic field
intergalactic medium
intermediate-band photometry
intermediate-population star
intermediate-type star
International Astronomical Union
International Atomic Time
International Celestial Reference Frame
International Celestial Reference System
International Cometary Explorer
International Date Line
International Gamma-Ray Astrophysics Laboratory
International Geophysical Year
International Sun–Earth Explorer
International Sunspot Number
International Ultraviolet Explorer
International Years of the Quiet Sun
interplanetary matter
interplanetary scintillation
interpulse
interstellar absorption
interstellar maser
interstellar matter
interstellar molecule
interstellar reddening
->
interstellar absorption
interstellar scintillation
interstellar wind
intrinsic colour index
intrinsic variable
invariable plane
inverse Compton effect
inverse Compton scattering
->
inverse Compton effect
inverse P Cygni profile
->
P Cygni profile
inverse-square law
inversion layer
->
atmospheric transparency
Io (moon)
iodine cell
ion
ionization
ionization equilibrium
ionization front
ionization potential
ionization temperature
ionopause
ionosphere
ionospheric scintillation
ion tail
->
cometary tail
Iota Aquarid meteors
IPCS
->
Image Photon Counting System
IQSY
->
International Years of the Quiet Sun
IR
->
infrared
IRAM
->
Institut de Radio Astronomie Millimétrique
IRAS
->
Infrared Astronomical Satellite
Comet IRAS–Araki–Alcock (C/1983 H1)
Iris (asteroid)
iron meteorite
iron peak
irradiance
irradiation
1
2
irregular galaxy
irregular variable
IRTF
->
NASA Infrared Telescope Facility
Isaac Newton Group
Isaac Newton Telescope
ISEE
->
International Sun–Earth Explorer
Ishtar Terra
ISM
->
interstellar matter
->
interstellar medium
ISO (observatory)
->
Infrared Space Observatory
isochron
isochrone
isophotal wavelength
isophote
isotherm
isothermal process
isothermal region
isotope
isotropy
IUE
->
International Ultraviolet Explorer
Izar
J
James Clerk Maxwell Telescope
James Webb Space Telescope
jansky
Karl Guthe Jansky
(Pierre) Jules César Janssen
Janus (moon)
JCMT
->
James Clerk Maxwell Telescope
JD
->
Julian Date
James Hopwood Jeans
Jeans length
Jeans mass
jet (astronomical objects)
Jet Propulsion Laboratory
Jewel Box
Jilin meteorite
J magnitude
Job's Coffin
Jodrell Bank Observatory
Johnson photometry
Johnson Space Center
Joint Astronomy Centre
Harold Spencer Jones
joule
Jovian planet
JPL
->
Jet Propulsion Laboratory
Julian calendar
Julian Date
Julian day number
Julian epoch
Juliet (moon)
Juno (asteroid)
Jupiter (planet)
Jupiter–family comet
JWST
->
James Webb Space Telescope
K
K
->
kelvin scale
Immanuel Kant
Kappa Crucis Cluster
->
Jewel Box cluster
Kappa Cygnid meteors
kappa mechanism
Jacobus Cornelius Kapteyn
Kapteyn Selected Areas
Kapteyn's Star
Kaus Australis
K corona
K-correction
Keck Telescopes
Keeler Gap
Kellner eyepiece
Lord (William Thomson) Kelvin
Kelvin–Helmholtz contraction
->
Helmholtz–Kelvin contraction
kelvin scale
Kennedy Space Center
Kepler (satellite)
Johannes Kepler
Johann Kepler
->
Johannes Kepler
Keplerian telescope
Kepler's equation
Kepler's laws
Kepler's Star
Kerr black hole
Keyhole Nebula
Keystone
Kids (asterism)
kinematic parallax
kinetic energy
kinetic temperature
Gustav Robert Kirchhoff
Kirchhoff's laws
Kirin meteorite
->
Jilin meteorite
Daniel Kirkwood
Kirkwood gaps
Kitt Peak National Observatory
Kleinmann–Low Nebula
KL Nebula
->
Kleinmann–Low Nebula
K line
->
H and K lines
K magnitude
knife-edge test
->
Foucault test
Kochab
Comet Kohoutek (C/1973 E1)
König eyepiece
->
Erfle eyepiece
Koronis family
KPNO
->
Kitt Peak National Observatory
Kracht group
Kramers opacity
KREEP
Kreutz sungrazer
Kron–Cousins RI photometry
Kruskal diagram
K star
Kueyen
Gerard Peter Kuiper
Kuiper Airborne Observatory
Kuiper Belt
L
labes
labyrinthus
Nicolas Louis de Lacaille
Lacerta
Lacertid
->
BL Lacertae object
lacus
Lagoon Nebula
Joseph Louis de Lagrange(-Tournier)
Lagrangian point
l'Aigle meteorite shower
Joseph Jérôme (Le Français) de Lalande
Lalande 21185
Lambda Boötis star
Lambda Eridani star
La Palma
->
Roque de los Muchachos Observatory
Pierre Simon de Laplace
Laplacian plane
Large Binocular Telescope
Large Magellanic Cloud
Large Millimeter Telescope
large-scale structure
Large Synoptic Survey Telescope
Larissa
Las Campanas Observatory
laser
Laser Interferometer Space Antenna
La Silla Observatory
William Lassell
Lassell ring
last contact
last quarter
La Superba
late heavy bombardment
late-type galaxy
late-type star
latitude
latitude variation
LBV
->
luminous blue variable
L dwarf
leap second
leap year
least circle of confusion
->
astigmatism
->
spherical aberration
Henrietta Swan Leavitt
Leda (moon)
Georges Édouard Lemaître
Lemaître universe
lens
Lense–Thirring effect
->
frame dragging
gravitational lens
lenticula
lenticular galaxy
Leo (constellation)
Leo Minor (constellation)
Leonid meteors
lepton
lepton era
Lepus
Leto family
Urbain Jean Joseph Le Verrier
<->
Urbain Jean Joseph Leverrier
Le Verrier Ring
Comet Lexell (D/1770 L1)
LHA
->
local hour angle
Libra (constellation)
first point of Libra
libration
libration point
->
Lagrangian point
Lick Observatory
light
speed of light
light bucket
->
flux collector
light cone
light-curve
light pollution
light pressure
->
radiation pressure
light time
light year
limb
limb brightening
limb darkening
limiting magnitude
1
2
Lincoln Near-Earth Asteroid Research
Bertil Lindblad
Lindblad resonance
linea
LINEAR
line blanketing
line broadening
line of apsides
line of inversion
->
magnetic inversion line
line of nodes
line profile
liner
line ratio
line receiver
line spectrum
linewidth
line wing
lingula
LISA
->
Laser Interferometer Space Antenna
LISA Pathfinder
Lissajous orbit
lithium star
lithosiderite
->
stony-iron meteorite
lithosphere
Little Dipper
Little Dumbbell
Liverpool Telescope
L magnitude
LMC
->
Large Magellanic Cloud
LMT
->
Large Millimeter Telescope
lobate ridge
lobate scarp
lobe
1
2
local arm
local bubble
Local Group
local hour angle
local mean time
local sidereal time
local standard of rest
local supercluster
local thermodynamic equilibrium
local time
Lockman hole
(Joseph) Norman Lockyer
lodranite
LOFAR
->
Low Frequency Array
LONEOS
->
Lowell Observatory Near-Earth Object Search
long-baseline interferometry
longitude
longitude at the epoch
longitude of perigee
longitude of perihelion
longitude of the ascending node
long-period comet
long-period variable
lookback time
loop prominence
Lorentz–Fitzgerald contraction
Lorentz transformation
Lost City meteorite
(Alfred Charles) Bernard Lovell
Lovell Telescope
Percival Lowell
Lowell Observatory
Lowell Observatory Near-Earth Object Search
lower culmination
Low Frequency Array
low-luminosity star
low-mass star
low surface brightness galaxy
low-velocity star
LRO
->
Lunar Reconnaissance Orbiter
LSR
->
local standard of rest
LSST
->
Large Synoptic Survey Telescope
LST
->
local sidereal time
LTP
->
lunar transient phenomenon
luminosity
luminosity class
luminosity evolution
->
galaxy evolution
luminosity function
luminosity–volume test
luminous arc
luminous blue variable
Luna (Moon probes)
lunar eclipse
lunar inequality
Lunar Module
Lunar Orbiter
lunar parallax
Lunar Prospector
Lunar Reconnaissance Orbiter
lunar theory
->
lunar inequality
lunar transient phenomenon
lunation
Knut Emil Lundmark
lunisolar precession
lunitidal interval
Lunokhod
Lupus
Lutz–Kelker bias
Willem ('William') Jacob Luyten
l.y.
->
light year
Lydia family
Lyman-α forest
Lyman-break Galaxy
Lyman limit
Lyman series
Lynx (constellation)
Bernard Ferdinand Lyot
Lyot filter
->
birefringent filter
Lyra (constellation)
Lyrid meteors
Lysithea
M
m
->
apparent magnitude
M
->
Messier Catalogue
M
->
absolute magnitude
MACHO
Mach's principle
macrospicules
macroturbulence
macula
Maffei Galaxies
Magdalena Ridge Observatory
Magellan
Magellanic Clouds
Magellanic Stream
Magellan Telescopes
magma
magnetar
magnetic inversion line
magnetic monopole
magnetic star
magnetic storm
->
geomagnetic storm
magnetic variable
magnetobremsstrahlung
magnetogram
magnetohydrodynamics
magnetopause
magnetosheath
magnetosphere
magnetotail
magnification
magnitude
magnitude of an eclipse
main beam
main-belt asteroid
->
asteroid belt
main lobe
->
main beam
main sequence
major axis
Maksutov telescope
Malin-1
Malmquist bias
manganese–mercury star
->
mercury–manganese star
manganese star
mantle
many-body problem
->
n-body problem
mare (astronomy)
Maria family
Mariner
Mariner Valley
->
Valles Marineris
Markab
Markarian galaxy
Mars (planet)
Marsden group
Mars Exploration Rover
Mars Express
Mars Global Surveyor
Marshall Space Flight Center
Mars Odyssey (2001 Mars Odyssey)
Mars Pathfinder
Mars probes
Mars Reconnaissance Orbiter
mascon
maser
maser amplifier
maser source
Nevil Maskelyne
mass
mass defect
mass discrepancy
mass function
mass loss
mass–luminosity relation
mass–radius relation
mass ratio
mass-to-light ratio
mass transfer
John Cromwell Mather
matter era
Mauna Kea Observatories
(Edward) Walter Maunder
Maunder minimum
maximum-entropy method
James Clerk Maxwell
Maxwell Gap
Maxwell Montes
Maxwell Telescope
->
James Clerk Maxwell Telescope
Mayall Telescope
McDonald Observatory
McIntosh scheme
->
sunspot
M-class asteroid
McMath–Pierce Solar Telescope
MDM Observatory
mean anomaly
mean daily motion
mean density of matter
mean equator
mean equinox
mean motion
mean parallax
->
statistical parallax
mean place
mean pole
mean position
->
mean place
mean sidereal time
mean solar day
mean solar time
mean sun
mean time
medium-band photometry
megamaser
megaregolith
Megrez
Melipal
meniscus lens
meniscus Schmidt telescope
Menkalinan
Menkar
Mensa (constellation)
mensa (planets)
Donald Howard Menzel
Merak
Mercury
mercury-manganese star
Mercury Surface, Space Environment, Geochemistry, and Ranging
celestial meridian
terrestrial meridian
meridian angle
meridian astronomy
meridian circle
meridian passage
->
meridian transit
meridian telescope
->
meridian circle
->
transit circle
->
transit instrument
meridian transit
MERLIN
->
Multi-Element Radio-Linked Interferometer Network
meson
mesopause
mesosiderite
mesosphere
MESSENGER
->
Mercury Surface, Space Environment, Geochemistry, and Ranging
Charles Joseph Messier
Messier Catalogue
Me star
metagalaxy
metal
metallic hydrogen
metal-poor star
metal-rich star
metastable state
meteor
Meteor Crater
meteorite
meteoroid
meteor shower
meteor storm
meteor stream
meteor swarm
methanol maser
Metis
Metonic cycle
Meudon Observatory
Meyer group
MHD
->
magnetohydrodynamics
Miaplacidus
Mice (galaxies)
Albert Abraham Michelson
Michelson interferometer
Michelson–Morley experiment
Michelson stellar interferometer
->
stellar interferometer
microchannel plate detector
microdensitometer
microlensing
micrometeorite
micrometer (measuring instrument)
micrometre
micron
micropore optics
Microscopium (constellation)
microturbulence
Microvariability and Oscillations of Stars
microvariable
microwave background radiation
microwaves
Midcourse Space Experiment
Mie scattering
Milky Way
millimetre-wave astronomy
millimetre waves
millisecond pulsar
Mills cross
Edward Arthur Milne
Milne–Eddington approximation
Mimas (moon)
Mimosa
->
Beta Crucis
Hermann Minkowski
Rudolph Leo Bernhard Minkowski
minor axis
minor planet
->
asteroid
Minor Planet Center
Mintaka
minute
minute of arc
<->
arcmin
Mira
Mirach
Miranda (moon)
Mira star
Mirphak
mirror
mirror blank
Mirzam
missing mass
Maria Mitchell
Mittenzwey eyepiece
mixing ratio
Mizar
MJD
->
Modified Julian Date
MK classification
->
Morgan–Keenan classification
MKK classification
->
Morgan–Keenan classification
M magnitude
MMT Observatory
mock Moon
->
parselene
mock Sun
->
parhelion
Modified Julian Date
moldavite
molecular cloud
molecular hydrogen
molecular line
molecule
Molonglo Radio Observatory
moment of inertia
MONET
->
Monitoring Network of Telescopes
Monitoring Network of Telescopes
monocentric eyepiece
Monoceros (constellation)
monochromatic light
monochromatic magnitude
monochromator
Monogem Ring
monopole
->
magnetic monopole
mons (planets)
month
Monthly Notices of the Royal Astronomical Society
Mont Mégantic Observatory
->
Observatoire du Mont-Mégantic
Moon
Mopra Observatory
Moreton wave
William Wilson Morgan
Morgan–Keenan classification
Morgan's classification
morning star
MOST
->
Microvariability and Oscillations of Stars
mottles
Mount Graham International Observatory
mounting
Mount Palomar Observatory
->
Palomar Observatory
Mount Stromlo and Siding Spring Observatories
Mount Wilson classification
->
sunspot
Mount Wilson Observatory
moustache
->
Ellerman bomb
moving cluster
MRAO
->
Mullard Radio Astronomy Observatory
M region
MRO
->
Magdalena Ridge Observatory
MSSSO
->
Mount Stromlo and Siding Spring Observatories
MS star
1
2
M star
MSX
->
Midcourse Space Experiment
Mu Cephei star
Mullard Radio Astronomy Observatory
Johann Müller
->
Regiomontanus
multi-beam receiver
Multi-Element Radio-Linked Interferometer Network
multiple star
multiplet
multi-ringed basin
->
impact basin
multiverse
muon
mural circle
Musca (constellation)
N
nadir
Nagler eyepiece
Naiad
Nal detector
naked eye
naked singularity
nakhlite
Nançay Radio Astronomy Observatory
nanometre
Naos
narrow-band photometry
NASA
->
National Aeronautics and Space Administration
NASA Infrared Telescope Facility
Nasir Eddin
->
al-Tusi
Nasser Eddin
->
al-Tusi
Nasmyth focus
National Aeronautics and Space Administration
National Astronomy and Ionosphere Center
->
Arecibo Observatory
National Optical Astronomy Observatory
National Radio Astronomy Observatory
National Solar Observatory
National Space Science Data Center
The Nautical Almanac
nautical twilight
n-body problem
NEA
->
near-Earth asteroid
neap tide
near-Earth asteroid
Near-Earth Asteroid Tracking
near infrared
NEAR Shoemaker
near ultraviolet
NEAT
->
Near-Earth Asteroid Tracking
nebula
nebula filter
nebular line
nebular variable
nebulosity
negative eyepiece
negative lens
->
diverging lens
Neptune (planet)
Nereid (moon)
Neumann lines
neutral hydrogen
neutral hydrogen line
->
21-centimetre line
neutral point
neutrino
neutrino astronomy
neutron
neutron degeneracy
neutron star
Simon Newcomb
New General Catalogue
New Horizons
New Millennium Program
new Moon
New Style date
New Technology Telescope
newton
Isaac Newton
Newtonian–Cassegrain telescope
Newtonian focus
Newtonian telescope
Newton's law of gravitation
Newton's laws of motion
N galaxy
NGC
->
New General Catalogue
nickel–iron meteorite
->
iron meteorite
Nicol prism
nightglow
->
airglow
night sky brightness
night vision
Nix Olympica
->
Olympus Mons
NLC
->
noctilucent clouds
nm
->
nanometre
N magnitude
NOAO
->
National Optical Astronomy Observatory
Nobeyama Radio Observatory
noble gas
noctilucent clouds
nocturnal
nodal line
node
nodical month
->
draconic month
non-baryonic matter
non-gravitational force
non-radial pulsation
non-thermal radiation
Nordic Optical Telescope
Norma (constellation)
normal astrograph
North America Nebula
Northern Coalsack
->
Great Rift
Northern Cross
->
Cygnus (constellation)
northern lights
->
aurora (astronomy)
North Galactic Spur
north polar distance
North Polar Sequence
North Star
->
Polaris
nova
nova-like variable
NPD
->
north polar distance
NRAO
->
National Radio Astronomy Observatory
NS
->
New Style date
NSO
->
National Solar Observatory
NSSDC
->
National Space Science Data Center
N star
->
carbon star
NTT
->
New Technology Telescope
Nubecula Major
->
Magellanic Clouds
Nubecula Minor
->
Magellanic Clouds
nuclear fusion
nuclear reaction
nuclear time-scale
nucleon
nucleosynthesis
atomic nucleus
cometary nucleus
galactic nucleus
null geodesic
number evolution
->
galaxy evolution
Nunki
nutation
nutation in right ascension
->
equation of the equinoxes
Nysa family
O
OAO
->
Orbiting Astronomical Observatory
OB association
Oberon
object glass
objective
objective grating
objective prism
oblateness
oblate spheroid
->
spheroid
oblique rotator
obliquity of the ecliptic
Observatoire du mont Mégantic
observatory
occultation
occulting bar
occulting disk
oceanus
OC star
octahedrite
Octans (constellation)
ocular
->
eyepiece
Oe star
off-axis guider
Of star
o.g.
->
object glass
OH–IR source
OH line
OH maser
OHP
->
Haute-Provence Observatory
Heinrich Wilhelm Matthäus Olbers
Olbers' paradox
Old Style date
Oljato (asteroid)
Olympus Mons
O magnitude
Omega Centauri
Omega Nebula
Onsala Space Observatory
ON star
Jan Hendrik Oort
Oort Cloud
Oort's constants
Oosterhoff group
Ootacamund Radio Astronomy Centre
opacity
open cluster
open universe
Ophelia (moon)
Ophiuchid meteors
Ophiuchus (constellation)
Ernst Julius Öpik
Oppenheimer–Volkoff limit
Opportunity (Mars rover)
opposition (astronomy)
opposition effect
optical axis
optical depth
optical double
optical flat
optical glass
optical interferometer
optical libration
optical pathlength
optical pulsar
optical thickness
->
optical depth
optical wedge
optics
orbit
orbital elements
orbital velocity
Orbiting Astronomical Observatory
Orbiting Solar Observatory
ordinary chondrite
organic molecule
Orgueil meteorite
Orientale Basin
Orion (constellation)
Orion Arm
Orion Association
Orionid meteors
Orion Molecular Clouds
Orion Nebula
Orion Spur
Orion variable
ORM
->
Roque de los Muchachos Observatory
orrery
orthoscopic eyepiece
OS
->
Old Style date
oscillating universe
osculating elements
osculating orbit
OSO
->
Orbiting Solar Observatory
O star
OT
->
Teide Observatory
outgassing
1
2
overcontact binary
oversampling
overshooting
overtone mode
OVV quasar
->
optically violently variable quasar
->
blazar
Owens Valley Radio Observatory
Owl Nebula
oxygen burning
ozonosphere
P
PA
->
position angle
PAH
->
polycyclic aromatic hydrocarbon
pair annihilation
pair production
palimpsest
Pallas (asteroid)
pallasite
Palomar Observatory
Palomar Observatory Sky Survey
palus
Pan (moon)
Pandora (moon)
Pan-STARRS
parabola
parabolic antenna
parabolic comet
parabolic orbit
parabolic velocity
paraboloid
parallactic angle
parallactic ellipse
parallactic inequality
parallactic motion
parallax
parametric amplifier
Paranal Observatory
paraxial
parent isotope
parfocal
parhelion
Paris Observatory
Parkes Observatory
parsec
parselene
William Parsons
->
Third Earl of Rosse
partial eclipse
particle
->
elementary particle
pascal (unit)
Paschen–Back effect
Paschen series
Pasiphae (moon)
passband
past light cone
->
light cone
patera
pathlength
->
optical pathlength
Paul Wild Observatory
Pavo (constellation)
Cecilia Helena Payne-Gaposchkin
pc
->
parsec
P-class asteroid
P Cygni line profile
P Cygni star
->
S Doradus star
Peacock (star)
peculiar galaxy
peculiar motion
peculiar star
peculiar velocity
pedestal crater
Peekskill meteorite
Pegasus (constellation)
Pele
Pelican Nebula
Penrose process
penumbra
1
2
penumbral eclipse
Arno Allan Penzias
perfect cosmological principle
peri-
periapsis
periastron
periastron effect
pericentre
perigee
perihelion
time of perihelion passage
orbital period
period–age relation
period–colour relation
period–density relation
periodic comet
periodic orbit
periodic perturbation
period–luminosity–colour relation
period–luminosity relation
period–mass relation
period–radius relation
period–spectrum relation
Perseid meteors
Perseus (constellation)
Perseus A
Perseus Arm
Perseus Cluster
personal equation
perturbation
Petzval surface
Pfund series
PHA
->
Potentially Hazardous Asteroid
Phad
Phaethon (asteroid)
phase
1
2
phase angle
phased array
phase defect
phase diagram
phase difference
phase rotator
phase-switching interferometer
phase transition
->
inflationary universe
Phecda
->
Phad
Pherkad
Phillips bands
Phobos (moon)
Phobos probes
Phocaea group
Phoebe (moon)
Phoenicid meteors
Phoenix (constellation)
Phoenix (Mars lander)
Pholus (asteroid)
photino
photocathode
photocell
->
photoelectric cell
photocentre
1
2
photoconductive cell
photodissociation
photodissociation region
photoelectric cell
photoelectric magnitude
photoelectric photometer
photographic amplification
photographic emulsion
photographic magnitude
photographic zenith tube
photoheliograph
photoionization
photometer
photometric binary
photometric parallax
photometric standard
->
standard star
photometry
photomultiplier
photon
photon sphere
photopolarimeter
->
polarimeter
photosphere
photovisual magnitude
photovoltaic detector
physical albedo
->
geometrical albedo
physical double
physical libration
Giuseppe Piazzi
Pic du Midi Observatory
Edward Charles Pickering
William Henry Pickering
Pickering Series
Pico Veleta
Pictor (constellation)
pincushion distortion
Pinwheel Galaxy
pion
Pioneer
Pioneer Venus
Pipe Nebula
Pisces (constellation)
Piscid meteors
Piscis Austrinid meteors
Piscis Austrinus (constellation)
pitch angle
pixel
plage
Planck (spacecraft)
Planck constant
Planck era
Planck's law
planemo
planet
planetarium
planetary aberration
planetary aspect
->
aspect
planetary migration
planetary nebula
planetary precession
planetesimal
planetoid
->
asteroid
->
Giuseppe Piazzi
planetology
planisphere
planitia
planoconcave lens
planoconvex lens
planum
John Stanley Plaskett
Plaskett's Star
plasma
plasmapause
plasmasphere
plasma tail
->
cometary tail
Plateau de Bure
plate centre
plate constants
plate-measuring machine
plate scale
plate tectonics
Platonic year
PLC relation
->
period–luminosity–colour relation
Pleiades
plerion
Plössl eyepiece
Plough (asterism)
PL relation
->
period–luminosity relation
plume
1
2
Plutino
Pluto
P magnitude
Pockels cell
Norman Robert Pogson
Pogson ratio
Pogson scale
Pogson step method
(Jules) Henri Poincaré
Pointers
point source
point-spread function
polar
->
AM Herculis star
->
DQ Herculis star
polar axis
polar cap
polar diagram
polar distance
polar flattening
polarimeter
polarimetry
->
polarization
Polaris
polarization
polar motion
polar orbit
polar plume
->
coronal plume
polar ring galaxy
polar sequence
polar wandering
pole
pole star
Pollux
polycyclic aromatic hydrocarbon
John Pond
Jean Louis Pons
stellar population
Population I
Population II
Population III
pore
Porrima
Porro prism
Portia (moon)
positional astronomy
->
astrometry
->
meridian astronomy
position angle
position-angle effect
position circle
position micrometer
->
filar micrometer
positive lens
->
converging lens
POSS
->
Palomar Observatory Sky Survey
post-nova
potassium–argon method
potential hazardous asteroid
power spectrum
Poynting–Robertson effect
PPM Star Catalogue
p-process
Praesepe
preceding
precession
precession constant
precession of the equinoxes
precursor pulse
pre-nova
pressure broadening
Príbram meteorite
primary cosmic ray
primary minimum
primary mirror
prime focus
prime meridian
prime vertical
primordial fireball
primordial galaxy
Principia
principle of equivalence
->
equivalence principle
prism
prismatic astrolabe
probable error
Procyon
prograde motion
->
direct motion
prolate spheroid
->
spheroid
Prometheus (moon)
prominence
prominence spectroscope
promontorium
proper motion
proper time
proplyd
proportional counter
Prospero (moon)
Proteus (moon)
protogalaxy
proton
proton–proton reaction
protoplanet
protoplanetary nebula
1
2
protostar
protosun
Proxima Centauri
p-spot
Ptolemaic system
Ptolemy
<->
Claudius Ptolemaeus
Publications of the Astronomical Society of the Pacific
Puck (moon)
Pulcherrima
->
Izar
pulsar
pulsating variable
pulsation mode
pulse broadening
pulse profile
pulse width
Pup (Sirius B)
pupil
Puppid–Velid meteors
Puppis (constellation)
Purkinje effect
PV Telescopii star
Pyxis
PZT
->
photographic zenith tube
Q
Q-class asteroid
Q magnitude
QSO
->
quasi-stellar object
QSS
->
quasi-stellar radio source
quadrant
Quadrantid meteors
quadrature
quadrupole
quantum
quantum cosmology
quantum efficiency
quantum gravitation
quantum theory
Quaoar
quark
quark star
quasar
quasi-stellar object
quasi-stellar radio source
quiescent prominence
quiet sun
quintessence
->
dark energy
R
RA
->
right ascension
radar astronomy
radar meteor
radial pulsation
radial velocity
radial-velocity spectrometer
radian
radiant
radiation
radiation belt
radiation era
radiation laws
->
Planck's law
->
Stefan–Boltzmann law
->
Wien's displacement law
radiation pressure
radiation temperature
radiative equilibrium
radiative recombination
->
free–bound transition
radiative transfer
radiative zone
radioactive age dating
radio astrometry
RadioAstron
radio astronomy
radio galaxy
radiogenic
radioheliograph
radio interferometer
radio jet
->
jet (astronomy)
radio meteor
radiometer
radiometric dating
->
radioactive age dating
radionuclide
radio source
radio star
radio telescope
radio waves
radio window
radius–luminosity relation
radius of curvature
radius vector
Raman effect
Ramaty High-Energy Solar Spectroscopic Imager
rampart crater
Ramsden disk
Ramsden eyepiece
Ranger (Moon probes)
RAS
->
Royal Astronomical Society
Rasalgethi
Rasalhague
Ra-Shalom (asteroid)
R association
raster
raster scan
RAS thread
RATAN-600
Rayleigh criterion
Rayleigh–Jeans formula
Rayleigh limit
->
Rayleigh criterion
Rayleigh number
Rayleigh scattering
crater rays
R Canis Majoris star
R-class asteroid
R Coronae Borealis star
Grote Reber
receiver
1
2
reciprocity failure
recombination
recombination epoch
recombination line
rectangular coordinates
recurrent nova
recycled pulsar
reddening
red dwarf
red giant
Red Planet
->
Mars (planet)
redshift
redshift–distance relation
redshift–magnitude relation
Red Spot
->
Great Red Spot
reduced proper motion
red variable
reference frame
->
frame of reference
reference star
reflectance spectrum
reflecting telescope
reflection effect
reflection grating
reflection nebula
reflection variable
reflector
->
reflecting telescope
refracting telescope
atmospheric refraction
refractive index
refractor
->
refracting telescope
refractory
regio
Regiomontanus
regmaglypt
regolith
regression of nodes
Regulus
relative orbit
relative sunspot number
relativistic beaming
relativistic velocity
relativity
relaxation time
remote sensing
réseau
residuals
resolution
->
resolving power
resolving power
resonance
resonance line
resonant scattering
rest mass
restricted three-body problem
retardation
retardation plate
->
wave plate
reticle
Reticulum (constellation)
reticulum (planets)
retrograde motion
reversing layer
revolution
RFT
->
richest-field telescope
RGO
->
Royal Greenwich Observatory
RGU photometry
Rhea (moon)
RHESSI
->
Ramaty High-Energy Solar Spectroscopic Imager
Rho Cassiopeiae star
Rho Ophiuchi Nebula
Richardson–Lucy algorithm
richest-field telescope
Rigel
right ascension
Rigil Kentaurus
->
Alpha Centauri
rille (Moon)
rima
planetary ring
ring arcs
ring galaxy
Ring Nebula
rise time
rising
George Willis Ritchey
Ritchey–Chrétien telescope
R magnitude
Robertson–Walker metric
Roche limit
Roche lobe
ROE
->
Royal Observatory, Edinburgh
Ole Christensen Römer
Olaus Christensen Römer
->
Ole Christensen Römer
Ronchi test
Rood–Sastry type
roof prism
Roque de los Muchachos Observatory
Rosalind (moon)
Rosat
Rosetta
Rosette Nebula
Frank Elmore Ross
Third Earl of Rosse
<->
William Parsons
Rosseland mean opacity
Bruno Benedetto Rossi
Rossiter effect
Rossi X-ray Timing Explorer
rotating variable
rotation
rotation curve
rotation effect
->
Rossiter effect
rotation measure
Royal Astronomical Society
Royal Greenwich Observatory
Royal Observatory, Edinburgh
r-process
RR Lyrae star
RRs variable
->
Delta Scuti star
RR Telescopii star
RS Canum Venaticorum star
R star
->
carbon star
Rubin–Ford effect
runaway star
rupes
Henry Norris Russell
Russell–Vogt theorem
->
Vogt–Russell theorem
RV Tauri star
RW Aurigae star
RXTE
->
Rossi X-ray Timing Explorer
Martin Ryle
Ryle Telescope
S
SAAO
->
South African Astronomical Observatory
Sabik
Sachs–Wolfe effect
Sacramento Peak Observatory
Carl Edward Sagan
Sagitta (constellation)
Sagittarius (constellation)
Sagittarius A
Sagittarius Arm
Sagittarius Dwarf Galaxy
Saha ionization equation
Sakigake
Salpeter function
->
initial mass function
Salpeter process
->
triple-alpha process
SALT
->
South African Large Telescope
SAMPEX
->
Solar, Anomalous, and Magnetospheric Particle Explorer
Allan Rex Sandage
SAO
->
Smithsonian Astrophysical Observatory
SAO Catalog
->
Smithsonian Astrophysical Observatory Star Catalog
saros
SAS
->
Small Astronomy Satellite
satellite
Saturn (planet)
Saturn Nebula
scale height
scattered-disk object
scatter ellipse
scattering
Scheat
Schechter function
Schedar
->
Shedir
Christoph Scheiner
Giovanni Virginio Schiaparelli
schiefspiegler telescope
Maarten Schmidt
Schmidt camera
Schmidt–Cassegrain telescope
Schönberg–Chandrasekhar limit
->
Chandrasekhar–Schönberg limit
Schröter effect
(Samuel) Heinrich Schwabe
Karl Schwarzschild
Schwarzschild black hole
Schwarzschild radius
Schwarzschild telescope
Comet 29P/Schwassmann–Wachmann 1
scintillation
scintillation counter
S-class asteroid
Sco-Cen Association
scopulus
Scorpius (constellation)
Scorpius X-1
Scotch mount
SC star
->
S star
SCT
->
Schmidt–Cassegrain telescope
Sculptor (constellation)
Sculptor group
Scutum (constellation)
SDO
->
Solar Dynamics Observatory
S Doradus star
SDSS photometry
Search for Extraterrestrial Intelligence
Seashell Galaxy
season
(Pietro) Angelo Secchi
Secchi classification
second
leap second
secondary cosmic ray
secondary crater
secondary minimum
secondary mirror
second contact
second of arc
secular
secular acceleration
secular parallax
secular perturbation
secular variable
seeing
segmented mirror
selected areas
->
Kapteyn Selected Areas
selective absorption
Selene (Moon probe)
selenology
self-absorption
semidetached binary
semidiameter
semi-forbidden line
->
forbidden line
semimajor axis
semiregular variable
sensitivity
separation
Serpens (constellation)
Serrurier truss
Setebos
SETI
->
Search for Extraterrestrial Intelligence
setting
setting circle
Seven Sisters
->
Pleiades
Sextans (constellation)
sextant
Carl Keenan Seyfert
Seyfert galaxy
Seyfert's Sextet
Shack–Hartmann test
->
Hartmann test
shadow bands
shadow transit
Shapiro delay
Harlow Shapley
Shapley Concentration
->
supercluster
shatter cone
Shaula
Shedir
shell burning
shell galaxy
shell star
shepherd moon
shergottite
shield volcano
shock metamorphism
Eugene Merle Shoemaker
Comet Shoemaker–Levy 9 (D/1993 F2)
shooting star
->
meteor
short-period comet
short-period variable
Sickle (asterism)
side lobe
sidereal
sidereal day
sidereal month
sidereal period
sidereal rate
sidereal time
sidereal year
siderite
->
iron meteorite
siderolite
->
stony-iron meteorite
siderophyre
siderostat
Siding Spring Observatory
Sigma Octantis
signal-to-noise ratio
->
sensitivity
Sikhote–Alin meteorite
silicon burning
silicon star
silvering
SIMBAD
SIM PlanetQuest
single-lined binary
singularity
Sinope (moon)
sinuous rille
sinus
SiO maser
Sirius
Sirrah
Willem de Sitter
SI units
six-colour system
61 Cygni
SKA
->
Square Kilometre Array
sky brightness
Skylab
Earl Carl Slipher
Vesto Melvin Slipher
Sloan Digital Sky Survey
slow nova
slow pulsator
SMA
->
Submillimeter Array
Small Astronomy Satellite
small circle
Small Magellanic Cloud
SMART-1
SMC
->
Small Magellanic Cloud
Smithsonian Astrophysics Observatory
Smithsonian Astrophysics Observatory Star Catalog
SMM
->
Solar Maximum Mission
George Fitzgerald Smoot III
SNC meteorites
SNR
->
supernova remnant
SNU
->
solar neutrino unit
SOAR
->
Southern Astrophysical Research telescope
SOFIA
->
Stratospheric Observatory for Infrared Astronomy
soft gamma-ray repeater
soft X-rays
SO galaxy
->
lenticular galaxy
SOHO
->
Solar and Heliospheric Observatory
Sojourner
Solar, Anomalous, and Magnetospheric Particle Explorer
solar activity
Solar and Heliospheric Observatory
solar antapex
solar apex
solar atmosphere
solar constant
solar cycle
->
sunspot cycle
solar day
Solar Dynamics Observatory
solar dynamo
solar eclipse
solar flare
solar interior
solar irradiance
solar mass
solar maximum
Solar Maximum Mission
solar minimum
solar motion
solar nebula
solar neutrino unit
Solar Orbiter
solar oscillations
->
helioseismology
solar parallax
Solar System
solar telescope
solar–terrestrial relations
Solar Terrestrial Relations Observatory
solar time
solar tower
solar wind
solar year
solid Schmidt telescope
solstice
solstitial colure
Sombrero Galaxy
Sothic cycle
source count
South African Astronomical Observatory
South Atlantic Anomaly
Southern African Large Telescope
Southern Astrophysical Research Telescope
Southern Cross
southern lights
Southern Reference Stars
Southern Sky Survey
South Pole Aitken Basin
curvature of space
->
curvature of spacetime
space motion
space probe
space reddening
->
interstellar absorption
Space Telescope Science Institute
spacetime
space velocity
Spacewatch
space weather
spallation
spark chamber
spec.
->
speculum metal
Special Astrophysical Observatory
special theory of relativity
speckle interferometry
spectral classification
spectral index
spectral line
spectral type
spectrogram
spectrograph
spectroheliogram
spectroheliograph
spectrohelioscope
spectrometer
spectrophotometer
spectrophotometry
spectropolarimetry
spectroscope
spectroscopic binary
spectroscopic parallax
spectroscopy
spectrum
1
2
spectrum binary
spectrum variable
->
Alpha2 Canum Venaticorum
speculum metal
Harold Spencer Jones
spherical aberration
spherical albedo
->
Bond albedo
spherical astronomy
spherical coordinates
spheroid
Spica
spicule
spider
spin
spinar
spin casting
Spindle Galaxy
spin-down
spin–orbit coupling
spin temperature
spiral arm
spiral galaxy
Spirit (Mars rover)
Lyman Spitzer, Jr
Spitzer Space Telescope
spokes
sporadic meteor
Gustav Friedrich Wilhelm Spörer
Spörer minimum
Spörer's law
spray
spring equinox
->
vernal equinox
Springfield mounting
spring tide
s-process
sputtering
Square Kilometre Array
Square of Pegasus
SS Cygni
SS Cygni star
SS433
S star
ST
->
standard time
standard atmosphere
standard epoch
standard solar model
standard star
standard time
standstill
star
starburst galaxy
star cluster
star count
Stardust
Stark broadening
starquake
starspot
star streaming
static limit
static universe
stationary point
1
2
statistical parallax
steady-state theory
Stefan–Boltzmann constant
Stefan–Boltzmann law
Stefan's law
->
Stefan–Boltzmann law
stellar association
stellar atmosphere
stellar evolution
stellar interferometer
stellar population
stellar structure
stellar wind
Stephano (moon)
Stephan's Quintet
step method
->
Argelander step method
->
Pogson step method
steradian
STEREO
->
Solar Terrestrial Relations Observatory
stereo comparator
Steward Observatory
stishovite
Stokes parameters
Stonyhurst heliographic coordinates
stony-iron meteorite
stony meteorite
stratigraphy
stratopause
stratosphere
Stratospheric Observatory for Infrared Astronomy
streamer
Strehl ratio
strewn field
1
2
string
->
cosmic string
Bengt Georg Daniel Strömgren
Strömgren photometry
Strömgren sphere
strontium star
Struve
Friedrich Georg Wilhelm von Struve
Otto Struve
Otto Wilhelm Struve
STScI
->
Space Telescope Science Institute
style
Subaru Telescope
subatomic particle
->
elementary particle
subdwarf
subgiant
subluminous star
sublunar point
Submillimeter Array
Submillimeter Wave Astronomy Satellite
submillimetre astronomy
sub-pulse
subsolar point
substellar object
substellar point
substorm
sudden ionospheric disturbance
Abd al-Raman al-Sufi
Suisei
sulcus
summer solstice
->
solstice
Summer Time
Summer Triangle
Sun
sundial
sundog
->
parhelion
Sunflower galaxy
sungrazer
->
Kreutz sungrazer
sunrise
sunset
sunskirter
sunspot
sunspot cycle
Sunyaev–Zel'dovich effect
supercluster
supergalactic plane
supergiant
supergiant elliptical
supergranulation
superheterodyne receiver
superhump
->
SU Ursae Majoris star
superior conjunction
superior planet
superluminal velocity
supermassive black hole
supermassive star
supermaximum
->
SU Ursae Majoris star
supernova
Supernova 1987A
supernova remnant
super-rotation
super-Schmidt telescope
superstring theory
supersynthesis
surface brightness
surface gravity
surface temperature
surge prominence
Surveyor (space probes)
SU Ursae Majoris star
Suzaku
S Vulpeculae star
Swan bands
Swan Nebula
->
Omega Nebula
SWAS
->
Submillimeter Wave Astronomy Satellite
Swift (satellite)
Comet 109P/Swift–Tuttle
Sword Hand of Perseus
Sword of Orion
SX Arietis star
SX Phoenicis star
Sycorax (moon)
symbiotic star
synchronous orbit
synchronous rotation
syndyname
synodic
synodic month
synodic period
Syrtis Major
Systems I, II, and III
syzygy
T
tachocline
tachyon
TAI
->
Temps Atomique International
->
International Atomic Time
cometary tail
tangential velocity
Tarantula Nebula
Tarazed
T association
Taurid meteors
Taurus
Taurus A
Taurus Molecular Clouds
Taurus Moving Cluster
Taurus X-1
TCB
->
Barycentric Coordinate Time
T-class asteroid
TDB
->
Temps Dynamique Barycentrique
->
Barycentric Dynamical Time
T dwarf
Teapot (asterism)
Comet Tebbutt (C/1861 J1)
technetium star
tectonics
Teide Observatory
tektite
telecompressor
tele-extender
telescope
telescope drive
->
drive
telescope mounting
->
mounting
Telescopio Nazionale Galileo
Telescopium (constellation)
Telesto
telluric lines
tellurium
Comet 55P/Tempel–Tuttle
temperature
temperature minimum
Tenma
termination shock
terminator
terra
terracing
terrestrial age
Terrestrial Dynamical Time
->
Terrestrial Time
terrestrial planet
Terrestrial Time
tesla
tessera
Tethys (moon)
Thalassa (moon)
Thales of Miletus
Tharsis Montes
Thebe (moon)
Themis family
Themisto (moon)
theory of everything
->
grand unified theory
thermal bremsstrahlung
->
free–free transition
thermal equilibrium
1
2
thermal radiation
thermocouple
thermodynamic equilibrium
->
thermal equilibrium
thermodynamic temperature
thermopile
thermosphere
thinned chip
Third Cambridge Catalogue
third contact
third quarter
->
last quarter
30 Doradus
->
Tarantula Nebula
Thirty Meter Telescope
tholus
William Thomson
->
Lord Kelvin
Thomson scattering
three-body problem
three-colour photography
->
astrophotography
three-colour photometry
->
Johnson photometry
three-kiloparsec arm
Thuban
Thule (asteroid)
tidal bulge
tidal evolution
tidal force
tidal friction
tidal heating
tides
time
time dilation
time of perihelion passage
time zone
TiO bands
tip–tilt mirror
Tisserand parameter
Titan (moon)
Titania (moon)
Titius–Bode law
->
Bode's law
TLP
->
lunar transient phenomenon
TMT
->
Thirty Meter Telescope
TNG
->
Galileo National Telescope
TNO
->
trans-Neptunian object
Toby Jug Nebula
Tolman test
Clyde William Tombaugh
topocentric
topocentric coordinates
Torino scale
Toro (asteroid)
torquetum
torus
total eclipse
totality
total magnitude
->
integrated magnitude
total solar irradiance
Toutatis (asteroid)
TRACE
->
Transition Region and Coronal Explorer
train (meteors)
transfer function
transfer lens
transfer orbit
transient lunar phenomenon
->
lunar transient phenomenon
meridian transit
planetary transit
transit circle
transit instrument
transition probability
transition region
Transition Region and Coronal Explorer
transmission grating
trans-Neptunian object
atmospheric transparency
transverse velocity
->
tangential velocity
Trapezium (star)
Triangulum (constellation)
Triangulum Australe (constellation)
Triangulum Galaxy
Trifid Nebula
trigonometric parallax
triple-alpha process
triplet (lens)
triquetrum
trischiefspiegler
->
schiefspiegler telescope
Triton (moon)
Trojan asteroid
tropic
tropical month
tropical period
tropical year
Tropic of Cancer
Tropic of Capricorn
tropopause
troposphere
true anomaly
true equator
true equinox
true pole
Trumpler classification
Trumpler star
TT
->
Terrestrial Time
T Tauri star
T Tauri wind
Tucana (constellation)
Tully–Fischer relation
Tunguska event
tuning-fork diagram
atmospheric turbulence
turnoff point
Nasir al-Din al-Tusi
Comet 41P/Tuttle–Giacobini–Kresák
21-centimetre line
twilight
twinkling
two-body problem
two-colour diagram
two-colour photometry
->
BV photometry
Two-Micron All-Sky Survey
two-spectrum binary
->
composite-spectrum binary
Tycho Brahe
Tycho Catalogue
Tychonic system
Tycho's Star
Type I supernova
->
supernova
Type II supernova
->
supernova
U
UBV photometry
->
Johnson photometry
UBVRIJKL photometry
->
Johnson photometry
U-class asteroid
U Geminorum star
Uhuru
UKIDSS
->
UKIRT Infrared Deep-Sky Survey
UKIDSS photometry
UKIRT
->
United Kingdom Infrared Telescope
UKIRT Infrared Deep-Sky Survey
UKST
->
United Kingdom Schmidt Telescope
ultra-compact dwarf galaxy
ultra-luminous infrared galaxy
ultraviolet astronomy
ultraviolet excess star
ultraviolet photometry
ultraviolet radiation
Ulugh Beg
Ulysses (spacecraft)
U magnitude
umbra
1
2
Umbriel (moon)
undae
undersampling
Undina family
unfilled aperture
unit distance
United Kingdom Infrared Telescope
United Kingdom Schmidt Telescope
Universal Time
Universe
unsharp masking
upper culmination
->
culmination
Upsilon Sagittarii star
Uranometria
Uranus
Urca process
ureilite
Harold Clayton Urey
Ursa Major
Ursa Major Moving Cluster
Ursa Minor
Ursid meteors
US Naval Observatory
USNO CCD Astrograph Catalog
UT
->
Universal Time
UTC
->
Universel Temps Coordonné
->
Coordinated Universal Time
Utopia Planitia
UU Herculis star
UV
->
ultraviolet
uvby system
->
Strömgren photometry
UV Ceti star
UV Persei star
UXor
->
UX Orionis star
UX Orionis star
UX Ursae Majoris star
V
vacuum energy
Valhalla (impact basin)
Valles Marineris
vallis
James Alfred Van Allen
Van Allen Belts
Van Biesbroeck's Star
Hendrik van de Hulst
van Maanen's Star
variable star
variation
1
2
variation of latitude
->
latitude variation
vastitas
Vatican Advanced Technology Telescope
VBLUW photometry
->
Walraven photometry
V-class asteroid
Vega (star)
Vega probes
Veil Nebula
Vela (constellation)
Vela pulsar
Vela Supernova Remnant
velocity curve
velocity dispersion
velocity–distance relation
Venera
Venus (planet)
Venus Express
VERITAS
->
Very Energetic Radiation Imaging Telescope Array System
vernal equinox
vertical circle
Very Energetic Radiation Imaging Telescope Array System
Very Large Array
Very Large Telescope
Very Long Baseline Array
very long baseline interferometry
very slow nova
->
RR Telescopii star
Very Small Array
Vesta (asteroid)
Viking (space probes)
VILGEN photometry
Vilnius photometry
violent relaxation
virga
Virginid meteors
Virgo (constellation)
Virgo A
Virgo Cluster
Virgo Supercluster
->
local supercluster
virial theorem
Virtual Observatory
virtual particle
Visible and Infrared Survey Telescope for Astronomy
VISTA
->
Visible and Infrared Survey Telescope for Astronomy
visual binary
visual magnitude
VLA
->
Very Large Array
VLBA
->
Very Long Baseline Array
VLBI
->
very long baseline interferometry
VLBI Space Observatory Programme
VLT
->
Very Large Telescope
V magnitude
Hermann Carl Vogt
Vogt–Russell theorem
void
Voigt profile
Volans
volatile
von Zeipel theorem
Voyager (space probes)
VSOP
->
VLBI Space Observatory Programme
Vulcan (hypothetical planet)
Vulpecula (constellation)
VV Cephei star
->
Zeta Aurigae star
VV Sculptoris star
W
walled plain
Walraven photometry
waning
Washington Double Star Catalog
Water Jar
water maser
->
H2O maser
water of hydration
wavefront
waveguide
wavelength
wavenumber
wave plate
waxing
WC star
->
Wolf–Rayet star
WDS
->
Washington Double Star Catalog
weber
weird terrain
Carl Friedrich von Weizsäcker
Werner lines
Comet West (C/1975 V1)
Westerbork Radio Observatory
Wezen
Fred Lawrence Whipple
Whipple Observatory
->
Fred Lawrence Whipple Observatory
Whirlpool Galaxy
whistler
white dwarf
white hole
white-light corona
WHT
->
William Herschel Telescope
Wide Field Infrared Survey Explorer
Widmanstätten pattern
Wielen dip
Wien's displacement law
Wild Duck Cluster
Wild's Triplet
Rupert Wildt
Wilkinson Microwave Anisotropy Probe
William Herschel Telescope
Robert Woodrow Wilson
Wilson–Bappu effect
Wilson effect
Comet 107P/Wilson–Harrington
WIMP
Wind (satellite)
winter solstice
->
solstice
WISE
->
Wide Field Infrared Survey Explorer
WIYN Telescope
WMAP
->
Wilkinson Microwave Anisotropy Probe
W. M. Keck Observatory
WN star
->
Wolf–Rayet star
Maximilian ('Max') Franz Joseph Cornelius
(Johann) Rudolf Wolf
Wolf diagram
Wolf–Lundmark–Melotte system
Wolf–Rayet star
Wolf sunspot number
Wolf 359
Wollaston prism
Wolter telescope
Richard van der Riet Woolley
world line
wormhole
Wright telescope
wrinkle ridge
WR star
->
Wolf–Rayet star
W Serpentis star
->
Algol star
W Ursae Majoris star
W Virginis star
Wyoming Infrared Observatory
WZ Sagittae star
X
XMM-Newton
X-ray astronomy
X-ray background
X-ray binary
X-ray bright point
->
coronal bright point
X-ray burst
X-ray calorimeter
X-ray nova
X-ray pulsar
X-rays
X-ray source
X-ray telescope
X-ray Timing Explorer
X-ray transient
XTE
->
Rossi X-ray Timing Explorer
XUV
->
extreme ultraviolet
Y
Yagi antenna
Yale Bright Star Catalogue
->
Bright Star Catalogue
Yarkovsky effect
Y dwarf
year
Yepun
Yerkes Observatory
Yerkes system
1
2
Y magnitude
Yohkoh
yoke mounting
YY Orionis star
Z
z
->
redshift
ZAMS
->
zero-age main sequence
Z Andromedae star
Zanstra method
ZC
->
Zodiacal Catalogue
Z Camelopardalis star
ZD
->
zenith distance
Zeeman effect
Zelenchukskaya
zenith
zenithal attraction
zenithal hourly rate
zenith distance
zenith telescope
zero-age horizontal branch
zero-age main sequence
Zeta Aurigae star
ZHR
->
zenithal hourly rate
zirconium star
->
S star
Z magnitude
zodiac
Zodiacal Catalogue
zodiacal dust
zodiacal light
Zond
zone catalogue
zone of avoidance
zone time
Zubenelgenubi
Zürich relative sunspot number
->
relative sunspot number
Fritz Zwicky
Zwicky Catalogue
ZZ Ceti star
Feature entries
active galactic nucleus
Big Bang theory
black hole
cosmic microwave background
cosmology
extrasolar planet
galaxy evolution
gamma-ray burst
nova
pulsar
quasar
redshift survey
Search for Extraterrestrial Intelligence
stellar evolution
supernova
time
Notes
The list might contain errors
When you click a red link, please check the spelling of the title before you create the article
1, 2 and 3 means that there exist more than one meaning of the term on the previous line
Sources
Ridpath, Ian (2007).
Oxford Dictionary of Astronomy
. Oxford University Press.
From Wikipedia, the free encyclopedia
<
User:Iceblock
The list might contain errors.
A
Å
->
angstrom
AAO
->
Anglo-Australian Observatory
AAS
->
American Astronomical Society
AAT
->
Anglo-Australian Telescope
AAVSO
->
American Association of Variable Star Observers
A band
Abell Catalogue
Abell cluster
Abell radius
constant of aberration
->
annual aberration
optical aberration
aberration of starlight
ablation
ablation age
absolute magnitude
1
2
absolute temperature
->
thermodynamic temperature
absolute zero
absorption
absorption coefficient
absorption edge
absorption line
absorption nebula
->
dark nebula
absorption spectrum
abundance
->
abundance of elements
Acamar
acceleration of free fall
accretion
accretion disk
ACE
->
Advanced Composition Explorer
Achernar
Achilles
achondrite
achromatic
achromatism
A-class asteroid
acronical
Acrux
->
Alpha Crucis
active galactic nucleus
active optics
active prominence
active region
John Couch Adams
Walter Sydney Adams
Adams Ring
adaptive optics
Adhara
adiabatic process
Adonis
Adrastea (moon)
ADS
->
Aitken Double Star Catalogue
Advanced Composition Explorer
ACE
advance of perihelion
advection
aeon
aerial
->
antenna
aerobraking
aerolite
->
stony meteorite
aeronomy
aerosol
Ae star
aether
->
ether
afocal
afterglow
AGB star
->
asymptotic giant branch star
Agena
->
Hadar
->
Beta Centauri
agglutinate
AGILE
AGK
AGN
->
active galactic nucleus
Ahnighito meteorite
->
Cape York meteorite
airglow
airmass
air shower
->
cosmic-ray shower
George Biddell Airy
Airy disk
Robert Grant Aitken
Aitken Double Star Catalogue
AI Velorum star
AJ
->
Astronomical Journal
Akari
Albategnius
->
al-Battani
al-Battani
->
Battani
albedo
albedo feature
Albireo
Alcor
Alcyone
Aldebaran
Alderamin
Alexandra family
ALEXIS
Hannes Olof Gösta Alfvén
Alfvén surface
Alfvén wave
Algenib
Algieba
Algol
Algol star
Algonquin Radio Observatory
Alhena
aliasing
alidade
Alioth
Alkaid
Allegheny Observatory
Allende meteorite
Allen Telescope Array
all-sky camera
ALMA
->
Atacama Large Millimeter Array
Almaak
Almagest
almanac
almucantar
Alnair
Alnath
Alnilam
Alnitak
α
->
right ascension
Alpha Capricornid meteors
Alpha Centauri
Alpha Crucis
Alpha Cygnid meteors
Alpha Cygni star
alpha particle
Alphard
Alpha Scorpiid meteors
Alpha2 Canum Venaticorum star
Alphekka
Alpheratz
Alrescha
Alshain
al-Sufi
->
Sufi
Altair
altazimuth mounting
altitude
al-Tusi
->
Tusi
aluminizing
Amalthea
Viktor Amazaspovich Ambartsumian
ambipolar diffusion
AM Canum Venaticorum star
American Association of Variable Star Observers
American Astronomical Society
Ames Research Center
AM Herculis star
Amor group
amplitude
1
2
Am star
anaemic spiral galaxy
analemma
Ananke
anastigmatic
Anaxagoras
Anaximander
Andromeda
Andromeda Galaxy
Andromedid meteors
Anglo-Australian Observatory
Anglo-Australian Telescope
Anders Jonas Ångström
angstrom
angular acceleration
angular diameter
angular distance
->
angular separation
angular momentum
angular resolution
angular separation
angular velocity
anisotropy
Ankaa
annealing
annual aberration
annual equation
annual inequality
->
annual equation
annual parallax
annual variation
annular eclipse
anomalistic month
anomalistic year
anomalous Cepheid
anomalous iron
anomaly
anorthosite
ANS
->
Astronomical Netherlands Satellite
ansa
ansae
antapex
->
solar apex
Antares
antenna
Antennae
antenna pattern
antenna temperature
anthelion
anthelion radiant
anthropic principle
anticentre
->
galactic anticentre
anti-dwarf nova
antimatter
antitail
Antlia
Eugène Michael Antoniadi
Antoniadi scale
Antu
ap-
apo-
Apache Point Observatory
apastron
aperture
aperture efficiency
aperture ratio
aperture synthesis
APEX
->
Atacama Pathfinder Experiment
apex
->
solar apex
aphelion
Aphrodite Terra
ApJ
->
Astrophysical Journal
aplanatic
apoapsis
apocentre
apochromatic
apodization
apogee
apohele
Apollo group
Apollonius of Perga
Apollo project
apparent diameter
->
angular diameter
apparent magnitude
apparent noon
apparent place
apparent retrogression
apparent sidereal time
apparent solar time
apparition
appulse
apse
->
apsides
apsis
->
apsides
apsidal motion
apsides
Ap star
Apus
Aquarid meteors
Aquarius
aqueous alteration
Aquila
Ara
arachnoid
François Arago
Dominique François Jean Arago
Arago ring
arc
archaeoastronomy
arch filament system
arc minute
->
minute of arc
arcmin
->
minute of arc
arc second
->
second of arc
arcsec
->
second of arc
Arcturus
arcus
area photometer
Arecibo Observatory
Comet Arend–Roland (C/1956 R1)
areo-
Friedrich Wilhelm August Argelander
Argelander step method
Argo Navis
argon–potassium method
->
potassium–argon method
argument of perihelion
Argyre Planitia
Ariel
Ariel satellites
Aries
first point of Aries
Aristarchos Telescope
Aristarchus of Samos
Aristotle
Arizona meteor crater
->
meteor crater
Arizona Radio Observatory
ARO
AR Lacertae star
armillary sphere
arm population
Arneb
array
1
2
artificial satellite
ASCA
ascending node
Asclepius
ashen light
ASP
->
Astronomical Society of the Pacific
aspect
aspheric
stellar association
Association of Universities for Research in Astronomy
AURA
A star
asterism
asteroid
asteroid belt
asteroseismology
asthenosphere
astigmatism
Astraea
astration
astrobiology
astrobleme
astrochemistry
astrodynamics
astrograph
Astrographic Catalogue
astrolabe
astrology
astrometric binary
astrometry
astronavigation
Astronomer Royal
Astronomer Royal for Scotland
The Astronomical Almanac
Astronomical Journal
AJ
Astronomical Netherlands Satellite
ANS
Astronomical Society of the Pacific
ASP
astronomical triangle
astronomical twilight
astronomical unit
AU
astronomy
Astronomy and Astrophysics
A&A
->
Astronomy and Astrophysics
astrophotography
Astrophysical Journal
astrophysics
ASTROSAT
astrum
Asuka
->
ASCA
asymptotic giant branch star
AGB star
Atacama Large Millimeter Array
ALMA
Atacama Pathfinder Experiment
APEX
ataxite
Aten group
Atlas
atmosphere
atmospheric extinction
atmospheric refraction
atmospheric scattering
->
atmospheric extinction
->
Mie scattering
->
Rayleigh scattering
atmospheric window
ATNF
->
Australia Telescope National Facility
atom
atomic clock
atomic time
Atria
attenuation
1
2
AU
->
astronomical unit
aubrite
Auger shower
->
cosmic-ray shower
augmentation
AURA
->
Association of Universities for Research in Astronomy
Auriga
Aurora programme
aurora
auroral oval
auroral substorm
->
substorm
Australia Telescope National Facility
ATNF
australite
autocorrelation
autocorrelator
autoguider
autoionization
autumnal equinox
->
equinox
averted vision
Avior
axion
optical axis
axis of rotation
azimuth
Azophi
->
al-Sufi
B
BAA
->
British Astronomical Association
Wilhelm Heinrich Walter Baade
Walter Baade
Baade's Window
Baade–Wesselink method
Harold Delos Babcock
Horace Welcome Babcock
background noise
background radiation
backscattering
Bailey type
Francis Baily
Baily's beads
Baker–Schmidt telescope
Baldwin effect
Balmer limit
Balmer lines
->
Balmer series
Balmer series
band
bandpass filter
bandwidth
bar
barium star
Barlow lens
Edward Emerson Barnard
Barnard's Loop
Barnard's Star
barn-door mount
->
Scotch mount
Barnes–Evans relationship
barred spiral galaxy
barrel distortion
Barringer Crater
->
meteor crater
barycentre
Barycentric Celestial Reference System
barycentric coordinates
Barycentric Coordinate Time
Barycentric Dynamical Time
baryon
baryon star
basalt
basaltic achondrite
baseline
impact basin
Muammad ibn Jabir al-Battani
Ba II star
->
barium star
Bautz–Morgan class
Johann Bayer
Bayer letters
B band
B-class asteroid
BCRS
->
Barycentric Celestial Reference System
BD
->
Bonner Durchmusterung
Beagle
beam
beaming
beamwidth
beat Cepheid
Becklin–Neugebauer Object (BN Object)
Becrux
->
Beta Crucis
bediasite
Beehive Cluster
->
Praesepe
Belinda
Bellatrix
Susan Jocelyn Bell Burnell
Jocelyn Bell Burnell
Belt of Orion
Benetnasch
->
Alkaid
Comet Bennett (C/1969 Y1)
bent-pillar mounting
BepiColombo
BeppoSAX
Berkeley–Illinois–Maryland Association Array (BIMA Array)
Friedrich Wilhelm Bessel
Besselian day numbers
Besselian elements
Besselian epoch
Besselian year
Be star
B(e) star
Beta Canis Majoris star
->
Beta Cephei star
Beta Cephei star
Beta Crucis
beta decay
Beta Lyrae star
beta particle
Beta Persei star
->
Algol star
Beta Pictoris
Beta Regio
Beta Taurid meteors
Betelgeuse
Hans Albrecht Bethe
Bethe–Weizsäcker cycle
->
carbon–nitrogen cycle
Bianca
Bianchi cosmology
biconcave lens
biconvex lens
Comet 3D/Biela
Bielid meteors
->
Andromedid meteors
Big Bang theory
Big Bear Solar Observatory
Big Crunch
Big Dipper
billitonite
BIMA Array
binary galaxy
binary pulsar
binary star
binding energy
binoculars
Jean-Baptiste Biot
bipolar group
bipolar nebula
bipolar outflow
birefringent filter
Birmingham Solar Oscillations Network
BiSON
->
Birmingham Solar Oscillations Network
black body
black-body radiation
black drop
black dwarf
Black Eye Galaxy
black hole
Black Widow Pulsar
->
binary pulsar
blazar
Blaze Star
Blazhko effect
BL Herculis star
blink comparator
Blinking Planetary
BL Lacertae object
BL Lac object
bloomed lens
blooming
1
2
blue clearing
blue compact dwarf galaxy
blue giant
blue Moon
1
2
Blue Planetary
blue populous cluster
->
Large Magellanic Cloud
blueshift
blue straggler
B magnitude
BN Object
->
Becklin–Neugebauer Object
Johann Elert Bode
Bode's law
Bartholomeus Jan Bok
Bartholomeus 'Bart' Jan Bok
Bok globule
->
globule
bolide
bolometer
bolometric correction
bolometric magnitude
Boltzmann constant
George Phillips Bond
William Cranch Bond
Bond albedo
Hermann Bondi
Bonner Durchmusterung
Boötes
boson
Boss General Catalogue
GC
boundary layer
bound–bound transition
bound–free transition
Bouwers telescope
Ira Sprague Bowen
Bowen fluorescence
bow shock
Bp star
Brackett series
James Bradley
Bragg crystal spectrometer
Tycho Brahe
Brans–Dicke theory
breccia
bremsstrahlung
bridge (astronomy)
bright nebula
brightness temperature
Bright Star Catalogue
British Astronomical Association
broad-band photometry
Brocchi's Cluster
Comet 16P/Brooks 2
->
Jupiter comet family
Ernest William Brown
brown dwarf
B star
Bubble Nebula
Budrosa family
Bug Nebula
bump Cepheid
Geoffrey Ronald Burbidge
Eleanor Margaret Burbidge
burst (astronomy)
Butcher–Oemler effect
Butler matrix
Butterfly Cluster
butterfly diagram
Butterfly Nebula
BV photometry
Bw star
BY Draconis star
Byurakan Astrophysical Observatory
C
Caelum
Calar Alto Observatory
caldera
calendar
calendar year
Caliban
California Nebula
Callippus
Callisto
Caloris Basin
Caltech Submillimeter Observatory
CSO
Calypso (moon)
Cambridge Optical Aperture Synthesis Telescope
COAST
Camelopardalis
William Wallace Campbell
Canada–France–Hawaii Telescope
canale
canali
Martian canals
Cancer
Tropic of Cancer
Canes Venatici
Canis Major
Canis Minor
Annie Jump Cannon
Canopus
cantaloupe terrain
Capella
Cape Photographic Durchmusterung
Cape photometry
Cape RI photometry
->
Kron–Cousins RI photometry
Cape York meteorite
Caph
Tropic of Capricorn
Capricornid meteors
Capricornus
captured rotation
->
synchronous rotation
Carafe Galaxy
carbonaceous chondrite
carbon burning
carbon cycle
->
carbon–nitrogen cycle
carbon flash
carbon–nitrogen cycle (CN cycle)
carbon star
Carina
Carina Arm
Carina Dwarf Galaxy
Carina–Sagittarius Arm
CARMA
->
Combined Array for Research in Millimeter-wave Astronomy
Carme
Carnegie Observatories
Carpo
Richard Christopher Carrington
Carrington heliographic coordinates
Carrington rotation
Carte du Ciel
Cartesian coordinates
Cartwheel Galaxy
Cassegrain telescope
Cassini
Giovanni Domenico Cassini
Jacques Cassini
Cassini Division
Cassini–Huygens
Cassiopeia
Cassiopeia A
Castalia
Castor
cataclysmic binary
cataclysmic variable
catadioptric system
Catalina Sky Survey
catalogue equinox
catena
catoptric system
Cat's Eye Nebula
cavus
CCD
->
charge-coupled device
CCD spectrometer
C-class asteroid
cD Galaxy
CDM
->
cold dark matter
CDS
->
Centre de Données astronomiques de Strasbourg
celestial axis
celestial coordinates
celestial equator
Celestial Intermediate Reference System
celestial latitude
celestial longitude
celestial mechanics
celestial meridian
celestial pole
celestial sphere
Centaur group
Centaurus
Centaurus A
Center for Astrophysics
Central Bureau for Astronomical Telegrams
central meridian
central peak
Centre de Données astronomiques de Strasbourg
centre of gravity
centre of inertia
centre of mass
centrifugal force
centripetal force
Cepheid instability strip
Cepheid variable
Cepheus
Cerenkov counter
Cerenkov radiation
Ceres
Cerro Pachón
Cerro Paranal
Cerro Tololo Inter-American Observatory
Cetus
CfA
->
Harvard–Smithsonian Center for Astrophysics
CGRO
->
Compton Gamma Ray Observatory
Chamaeleon
Chandler period
Chandler wobble
Subrahmanyan Chandrasekhar
Chandrasekhar limit
Chandrasekhar-Schönberg limit
Chandra X-ray Observatory
Chandrayaan-1
Chang'e
chaos
chaotic orbit
chaotic terrain
CHARA Array
charge
charge-coupled device
Charon
chasma
chassignite
chemical element
chemosphere
Chicxulub
CHIPSat
Chiron
Ernst Florens Friedrich Chladni
chondrite
chondrule
chopper
chopping secondary
William Henry Mahoney Christie
chromatic aberration
chromosphere
chromospheric network
Chryse Planitia
CH star
Circinus
Circlet
circular velocity
circumpolar
circumstellar maser
circumstellar matter
Cirrus Nebula
->
Veil Nebula
CIRS
->
Celestial Intermediate Reference System
cislunar
civil time
civil twilight
civil year
Alexis Claude Clairaut
Alvan Clark
classical Cepheid
clast
clathrate
CLEAN
Clementine
James Clerk Maxwell
C line
clock drive
->
drive
clock star
closed universe
Clown Face Nebula
->
Eskimo Nebula
Cluster
star cluster
->
globular cluster
star cluster
->
open cluster
cluster, star
->
star cluster
cluster of galaxies
cluster variable
->
RR Lyrae star
CMB
->
cosmic microwave background
CME
->
coronal mass ejection
CM relation
->
colour–magnitude relation
CN band
CN cycle
->
carbon–nitrogen cycle
CNO cycle
->
carbon–nitrogen–oxygen cycle
CN star
Coalsack
coaltitude
COAST
Coathanger
COBE
Cocoon Nebula
cocoon star
CoD
->
Córdoba Durchmusterung
coded mask
coelostat
coesite
coherence
coherence bandwidth
colatitude
cold camera
cold dark matter
collapsar
colles
collimation
collimation error
collimator
Colombo Gap
colorimetry
->
colour index
colour
->
colour index
colour excess
colour index
colour–luminosity relation
->
colour–magnitude relation
colour–magnitude relation
colour temperature
Columba
column density
colure
cometary coma
optical coma
Coma Berenices
Coma Cluster
Coma Star Cluster
Coma–Virgo Cluster
->
Virgo Cluster
Combined Array for Research in Millimeter-wave Astronomy
combined magnitude
comes
comet
cometary globule
comet family
comet-seeker
commensurability
Andrew Ainslie Common
common envelope binary
common proper motion
compact galaxy
compact object
compact source
comparator
comparison spectrum
composite-spectrum binary
Compton effect
Compton Gamma Ray Observatory
Compton–Getting effect
Compton scattering
->
Compton effect
Compton upscattering
->
inverse Compton scattering
Concordia family
Cone Nebula
confusion
conic section
conjunction
constant of aberration
->
annual aberration
constellation
constructive interference
->
interference
contact binary
continuous creation
continuous spectrum
continuum
stellar convection
convective envelope
convective equilibrium
convective overshoot
->
overshooting
convective zone
convergent point
converging lens
convolution
Thomas Cooke
cooled camera
->
cold camera
cooling flow
coorbital
Coordinated Universal Time
coordinate systems
->
celestial coordinates
coordinate time
Copernican system
Nicolaus Copernicus
Copernicus satellite
Coprates
Cor Caroli
Cordelia
Córdoba Durchmusterung
planetary core
stellar core
core collapse
1
2
Coriolis force
corona
1
2
3
Corona Australis
Corona Borealis
coronagraph
coronal bright point
coronal condensation
coronal hole
coronal lines
coronal loop
coronal mass ejection
coronal plume
coronal rain
COROT
co-rotation
corpuscular radiation
1
2
corrector plate
correlation detection
correlation function
correlation receiver
correlator
Corvus
COS-B
cosmic abundance
Cosmic Background Explorer
cosmic background radiation
->
cosmic microwave background
CBR
->
cosmic background radiation
cosmic censorship
cosmic dust
cosmic microwave background
cosmic rays
cosmic-ray shower
cosmic scale factor
cosmic string
cosmic texture
cosmic year
cosmochemistry
->
astrochemistry
cosmological constant
cosmological distance scale
cosmological principle
cosmology
cosmos
Cosmos satellites
COSPAR
coudé focus
Couder telescope
counterglow
->
gegenschein
Philip Herbert Cowell
c.p.m.
->
common proper motion
Crab Nebula
Crab Pulsar
Crater
crater
crater chain
crater counting
crêpe ring
crepuscular rays
crescent
Cressida
Crimean Astrophysical Observatory
critical density
Andrew Claude de la Cherois Crommelin
cross-axis mounting
crossing time
cross-wire micrometer
crown glass
crust
Crux
cryostat
cryovolcanism
C star
CTIO
->
Cerro Tololo Inter-American Observatory
Cubewano
culmination
curvature of field
curvature of space
->
curvature of spacetime
curvature of spacetime
curvature radiation
curve of growth
cusp
cusp gap
Cybele group
cyclotron maser
cyclotron radiation
Cygnus
Cygnus A
Cygnus Loop
Cygnus Rift
Cygnus X-1
Cynthian
Cytherean
D
Dactyl
Dall–Kirkham telescope
Damocles
Damocloid
André Danjon
Danjon astrolabe
Danjon scale
dark adaptation
dark energy
dark galaxy
dark matter
dark nebula
daughter isotope
Davida
David Dunlap Observatory
Raymond Davis, Jr
William Rutter Dawes
Dawes limit
Dawn
day
Daylight Saving Time
->
Summer Time
day number
1
2
D-class asteroid
DCT
->
Discovery Channel Telescope
DDO classification
DDO photometry
dec.
->
declination
deceleration parameter
Comet de Chéseaux (C/1743 X1)
declination
declination axis
deconvolution
decoupling
dedispersion
Deep Impact
deep-sky object
Deep Space Network
Deep Space 1
defect of illumination
deferent
deflection of light
degeneracy
degenerate star
degree of arc
degrees of freedom
Deimos
delay line
Delphinus
δ
->
declination
delta
->
declination
Delta Aquarid meteors
Delta Cepheid star
->
classical Cepheid
Delta Delphini star
Delta Scuti star
delta T
ΔT
Demon Star
Deneb
Deneb Kaitos
Denebola
William Frederick Denning
density parameter
density wave
descending node
Desdemona
Willem de Sitter
de Sitter universe
Despina
destructive interference
->
interference
detached binary
deuterium
Gérard Henri de Vaucouleurs
dewar
dew cap
D galaxy
diagonal
diamond ring
Diana Chasma
dichotomy
dichroic mirror
Robert Henry Dicke
Dicke radiometer
Dicke switch
dielectronic recombination
differential rotation
differentiation
diffraction
diffraction grating
diffraction-limited
diffraction pattern
diffraction rings
diffuse interstellar bands
diffuse nebula
diogenite
Dione
dioptric system
Diphda
->
Deneb Kaitos
dipole
1
2
3
dipole antenna
Dirac cosmology
directivity
direct motion
dirty snowball
disconnection event
Discovery Channel Telescope
Discovery Program
dish antennae
disk galaxy
disk population
disparition brusque
->
filament
dispersion
1
2
dispersion measure
distance modulus
distortion
diurnal
diurnal aberration
diurnal inequality
diurnal libration
diurnal motion
diurnal parallax
diverging lens
D layer
D lines
dMe star
Dobsonian telescope
Dog Star
John Dollond
domain wall
dome
Dominion Astrophysical Observatory
Dominion Radio Astrophysical Observatory
Comet Donati (C/1858 L1)
Christian Johann Doppler
Doppler broadening
Doppler effect
->
Doppler shift
dopplergram
Doppler shift
Dorado
dorsum
Double Cluster
Double Double
double-lined binary
double-mode variable
double pulsar
double quasar
double star
doublet
1
2
DQ Herculis star
Draco
draconic month
Draconid meteors
->
Giacobinid meteors
Drake equation
Henry Draper
Draper
drawtube
Johan Ludvig Emil Dreyer
drifting sub-pulse
drift scan
drive
D star
Dubhe
Dumbbell Nebula
dust
dust tail
->
cometary tail
duty cycle
dwarf Cepheid
dwarf galaxy
dwarf nova
dwarf planet
dwarf spheroidal galaxy
dwarf star
dwarf variable
Dwingeloo galaxy
Dwingeloo Radio Observatory
dynamical equinox
dynamical friction
dynamical parallax
dynamical time
dynamo
Frank Watson Dyson
E
Eagle Nebula
early-type galaxy
early-type star
Earth
Earth coorbital asteroid
->
Apollo group
->
Aten group
Earth-crossing asteroid
->
Amor group
Earth-approaching asteroid
earthlight
->
earthshine
eccentric anomaly
eccentricity
echelle grating
echelle spectrograph
E-class asteroid
eclipse
eclipse season
eclipse year
eclipsing binary
ecliptic
ecliptic coordinates
ecliptic latitude
ecliptic limits
ecliptic longitude
ecliptic pole
E corona
Arthur Stanley Eddington
Eddington limit
Edgeworth–Kuiper Belt
->
Kuiper Belt
E-ELT
->
European Extremely Large Telescope
effective aperture
effective area
effective focal length
effective temperature
Effelsberg Radio Observatory
Egg Nebula
Albert Einstein
Einstein coefficient
Einstein Cross
Einstein–de Sitter universe
Einstein Observatory
Einstein ring
Einstein shift
->
gravitational redshift
ejecta
Elara
E layer
electromagnetic radiation
electromagnetic spectrum
electron
electron degeneracy
electron density
electron scattering opacity
electron temperature
electronvolt
chemical element
optical element
elementary particle
abundance of elements
orbital elements
E line
Ellerman bomb
ellipse
ellipsoid
ellipsoidal variable
elliptic aberration
->
E-terms
elliptical galaxy
ellipticity
->
oblateness
Elnath
->
Alnath
elongation
1
2
Eltanin
->
Etamin
Elysium Planitia
emersion
emission
emission line
emission nebula
emission spectrum
emissivity
photographic emulsion
Enceladus
Comet 2P/Encke
Johann Franz Encke
Encke Division
energy level
English mounting
Enif
Ensisheim meteorite
enstatite chondrite
entrainment
entropy
envelope (astronomy)
eon
->
aeon
Eos family
epact
Ep galaxy
ephemeris
Ephemeris Time
epicycle
Epimetheus
epoch
e-process
Epsilon Aurigae
equant
equation (astronomy)
equation of light
equation of the centre
equation of the equinoxes
equation of the origins
equation of time
equator
equatorial bulge
equatorial coordinates
equatorial horizontal parallax
equatorial mounting
equinoctial colure
equinox
equipotential surface
equivalence principle
equivalent focal length
equivalent width
Equuleus
ERA
->
Earth rotation angle
Eratosthenes
Erfle eyepiece
ergosphere
Eridanus
Eris
Eros
eruptive binary
eruptive prominence
eruptive variable
ESA
->
European Space Agency
escape velocity
Eskimo Nebula
ESO
->
European Southern Observatory
ET
->
Ephemeris Time
Eta Aquarid meteors
Eta Carinae
Eta Carinae Nebula
etalon
Etamin
E-terms
ether
eucrite
Eudoxus of Cnidus
Leonhard Euler
Eunomia family
Europa
European Extremely Large Telescope
European Southern Observatory
European Space Agency
European VLBI Network
EUV
->
extreme ultraviolet
EUVE
->
Extreme Ultraviolet Explorer
eV
->
electronvolt
evection
evening star
event horizon
Evershed effect
EVN
->
European VLBI Network
evolved star
excitation
excitation temperature
exit cone
exit pupil
EX Lupi star
exobiology
->
astrobiology
ExoMars
exoplanet
->
extrasolar planet
EXor
->
EX Lupi star
Exosat
exosphere
expanding universe
Explorer
exposure age
extended source
1
2
atmospheric extinction
interstellar extinction
extragalactic nebula
->
galaxy
extrasolar planet
extreme Population I star
extreme ultraviolet
Extreme Ultraviolet Explorer
extrinsic variable
eye lens
eyepiece
eye relief
F
Faber–Jackson relation
David Fabricius
Johann Fabricius
Johannes Fabricius
Fabry lens
Fabry–Perot interferometer
facula
1
2
fall
falling star
->
meteor
False Cross
Fanaroff–Riley class
fan beam
Faraday effect
far infrared
farrum
far ultraviolet
Far Ultraviolet Spectroscopic Explorer
Fast Auroral Snapshot Explorer
fast nova
Faulkes Telescopes
fault
F band
F-class asteroid
F corona
feed
fermion
fibrille
field curvature
->
curvature of field
field equations
field flattener
field lens
field of view
field star
field stop
53 Persei star
figure
filament
1
2
filamentary nebula
filar micrometer
filigree
filled aperture
filled-centre supernova remnant
->
plerion
filter
1
2
filtergram
find
finder
fine structure
fireball
first contact
first point of Aries
first point of Libra
first quarter
Fish Mouth
fission
fission track
Fitzgerald contraction
->
Lorentz–Fitzgerald contraction
fixed stars
FK
FK Comae Berenices star
John Flamsteed
Flamsteed numbers
solar flare
flare star
flash spectrum
flash star
flat
polar flattening
F layer
Williamina Paton Fleming
flexus
flickering
flint glass
flocculi
1
->
mottles
2
->
plages
Flora group
fluctus
flumen
fluorescence
fluorite
flux
flux collector
flux density
1
2
flux tube
flux unit
f/number
focal distance
focal length
focal plane
focal point
focal ratio
focal reducer
focal surface
optical focus
orbital focus
Fokker–Planck equation
folded dipole
following
Fomalhaut
footpoint
->
coronal loop
forbidden line
Forbush effect
fork mounting
Fornax
Fornax A
Fornax Dwarf Galaxy
47 Tucanae
forward scattering
fossa
Foucault test
four-colour photometry
->
Strömgren photometry
Fourier analysis
Fourier transform
Fourier transform spectrometer
fourth contact
William Alfred Fowler
Fp star
fractional method
frame dragging
frame of reference
Franklin-Adams charts
Joseph von Fraunhofer
Fraunhofer lines
Fred Lawrence Whipple Observatory
free–bound transition
free–free transition
frequency
frequency analysis
->
Fourier analysis
Friedmann universe
fringe
->
interference pattern
fringe pattern
f-spot
F star
FTS
->
Fourier transform spectroscopy
full Moon
full-wave dipole
full width at half maximum
fundamental catalogue
fundamental mode
fundamental plane
fundamental star
fuor
->
FU Orionis star
FUSE
->
Far Ultraviolet Spectroscopic Explorer
fusion
fusion crust
future light cone
->
light cone
FWHM
->
full width at half maximum
G
g
->
acceleration of free fall
G
->
gravitational constant
Gacrux
->
Gamma Crucis
Gaia
gain
galactic anticentre
galactic bulge
galactic centre
galactic cluster
galactic coordinates
galactic disk
galactic equator
galactic halo
galactic latitude
galactic longitude
galactic magnetic field
galactic nucleus
galactic plane
galactic pole
galactic rotation
galactic window
galactic year
->
cosmic year
Galatea
Galaxy
galaxy
galaxy cannibalism
galaxy cluster
galaxy encounter
galaxy evolution
Galaxy Evolution Explorer
galaxy formation
galaxy merger
GALEX
->
Galaxy Evolution Explorer
Galilean satellites
Galilean telescope
Galileo
Galileo Galilei
Galileo National Telescope
Galileo Regio
Johann Gottfried Galle
Galle Ring
Gamma Cassiopeiae star
Gamma Crucis
Gamma Doradus star
gamma-ray astronomy
gamma-ray background
gamma-ray burst
Gamma-ray Large Area Space Telescope
gamma rays
gamma-ray telescope
George Gamow
Ganymede
Sergei Illarionovich Gaposchkin
->
Cecilia Payne-Gaposchkin
Garnet Star
gas giant
->
giant planet
Gaspra
gas scintillation proportional counter
gas tail
->
cometary tail
Carl Friedrich Gauss
Gaussian gravitational constant
G band
G-class asteroid
GCRS
->
Geocentric Celestial Reference System
GCVS
->
General Catalogue of Variable Stars
gegenschein
Geminga
Gemini
Geminid meteors
Gemini Observatory
Gemma
->
Alphekka
General Catalogue of Variable Stars
general precession
general theory of relativity
Genesis
Geneva photometry
geo-
geocentric
Geocentric Celestial Reference System
geocentric coordinates
Geocentric Coordinate Time
geocentric equatorial parallax
geocentric parallax
geocorona
geodesic
geodesy
Geographos
geoid
geomagnetic storm
geomagnetism
geometrical albedo
geometrical libration
->
optical libration
georgiaite
geostationary orbit
geosynchronous orbit
geotail
->
magnetotail
germanium detector
German mounting
GHA
ghost crater
Ghost of Jupiter
Riccardo Giacconi
Giacobinid meteors
Comet 21P/Giacobini–Zinner
giant branch
Giant Magellan Telescope
Giant Metrewave Radio Telescope
giant molecular cloud
giant planet
giant star
gibbous
Gienah
David Gill
Ginga
Giotto
GLAST
->
Gamma-ray Large Area Space Telescope
Glauke
glitch
Global Oscillation Network Group
globular cluster
globule
GMAT
->
Greenwich Mean Astronomical Time
GMC
->
giant molecular cloud
GMST
->
Greenwich Mean Sidereal Time
GMT
->
Greenwich Mean Time
GMT
->
Giant Magellan Telescope
gnomon
Goddard Space Flight Center
Gödel universe
Thomas Gold
Goldstone
GONG
->
Global Oscillation Network Group
John Goodricke
GoTo telescope
Benjamin Apthorp Gould
Gould's Belt
graben
interplanetary grains
interstellar grains
Granat
grand unified theory
Gran Telescopio Canarias
granulation
graticule
->
reticle
grating
->
diffraction grating
grating spectrometer
gravitation
gravitational acceleration
gravitational collapse
gravitational constant
gravitational deflection
gravitational energy
gravitational field
gravitational force
gravitational instability
gravitational lens
gravitational mass
gravitational radiation
gravitational wave
graviton
gravity assist
gravity gradient
Gravity Probe B
grazing-incidence telescope
grazing occultation
GRB
->
gamma-ray burst
Great Attractor
Great Bear
->
Ursa Major
great circle
Great Dark Spot
greatest brilliancy
greatest elongation
Great Observatories
Great Red Spot
Great Rift
Great September Comet (C/1882 R1)
Great Wall
Green Bank
Green Bank Telescope
green flash
greenhouse effect
Greenwich hour angle
Greenwich Mean Astronomical Time
Greenwich Mean Sidereal Time
Greenwich Mean Time
Greenwich meridian
Greenwich Observatory
Greenwich sidereal date
Greenwich Sidereal Time
Gregorian calendar
Gregorian telescope
James Gregory
Comet 26P/Grigg–Skjellerup
grism
grooved terrain
Grotrian diagram
ground state
GRS
->
Great Red Spot
Howard Grubb
Grus
GST
->
Greenwich Sidereal Time
G star
GTC
->
Gran Telescopio Canarias
Guardians
guest star
guider
guide star
guide telescope
Gum Nebula
GUT
->
grand unified theory
GW Virginis star
->
ZZ Ceti star
gyrofrequency
gyrosynchrotron radiation
H
HA
->
hour angle
Hadar
Hadley circulation
Hadley Rille
hadron
hadron era
HAEBE
->
Herbig Ae/Be star
Haedi
->
Kids
Haig mount
->
Scotch mount
Hakucho
halation
HALCA
George Ellery Hale
Comet Hale–Bopp (C/1995 01)
Hale Observatories
Hale's law
->
bipolar group
Hale telescope
half-life
half-wave dipole
half-width
->
full width at half maximum
Asaph Hall
Edmond Halley
Halley-family comet
Halley's Comet
atmospheric halo
galactic halo
halo CME
halo orbit
halo population
Hα
Hamal
H and K lines
Hanle effect
hard X-rays
Haro galaxy
Hartebeesthoek Radio Astronomy Observatory
HartRAO
->
Hartebeesthoek Radio Astronomy Observatory
Hartmann test
Haruka
->
HALCA
Harvard classification
Harvard College Observatory
Harvard Revised Photometry
Harvard–Smithsonian Center for Astrophysics
harvest Moon
Hat Creek Radio Observatory
Hathor
Haute-Provence Observatory
Stephen William Hawking
Hawking radiation
Hayabusa
Hayashi track
Haystack Observatory
HCG
->
Hickson compact group
HD Catalogue
->
Henry Draper Catalogue
cometary head
head–tail galaxy
HEAO
->
High Energy Astrophysical Observatory
heat death of the Universe
Heaviside layer
->
E layer
heavy element
heavy-metal star
Hebe
Hektor
Helene
heli-
->
Sun
helio-
->
Sun
heliacal rising and setting
heliocentric
1
2
heliocentric coordinates
heliocentric latitude
heliocentric longitude
heliocentric parallax
->
annular parallax
heliographic coordinates
heliometer
heliopause
helioseismology
heliosheath
heliosphere
Helios probes
heliostat
helium burning
helium flash
helium shell flash
helium star
Helix Nebula
Hellas Planitia
helmet streamer
->
streamer
Helmholtz–Kelvin contraction
hemispherical albedo
Henry Draper Catalogue
Henyey track
Hephaistos
Heraclides of Pontus
Herbig Ae/Be star
Herbig–Haro object
Hercules
Hercules Cluster
Hercules X-1
Herculina
Hermes
Caroline Lucretia Herschel
Karoline Lucretia Herschel
->
Caroline Lucretia Herschel
John Frederick William Herschel
Frederick William Herschel
->
William Herschel
Friedrich Wilhelm Herschel
->
William Herschel
William Herschel
Herschelian telescope
Comet 35P/Herschel–Rigollet
Herschel Space Observatory
Hertha family
->
Nysa family
hertz
Ejnar Hertzsprung
Hertzsprung gap
Hertzsprung–Russell diagram
Victor Francis Hess
HESSI
->
Ramaty High-energy Solar Spectroscopic Imager
HETE-2
->
High Energy Transient Explorer-2
Johannes Hevelius
Antony Hewish
hexahedrite
HH object
->
Herbig–Haro object
Hickson compact group
Hidalgo
hierarchical cosmology
High Energy Astrophysical Observatory
high-energy astrophysics
High-Energy Transient Explorer-2
lunar highlands
high-speed photometry
high-velocity cloud
high-velocity star
Hilda group
George William Hill
Himalia
Hind's Crimson Star
Hind's Variable Nebula
Hinode
Hinotori
Hipparchus of Nicaea
Hipparcos
Hirayama family
Hiten
H line
->
H and K lines
H magnitude
Hoba West meteorite
Hobby–Eberly Telescope
Hohmann orbit
Holmberg radius
homogeneity
homology
Homunculus Nebula
H I region
Hooker Telescope
horizon
horizontal branch
horizontal coordinates
horizontal parallax
horizontal refraction
horn antenna
Horologium
Jeremiah Horrocks
Jeremiah Horrox
->
Jeremiah Horrocks
Horsehead Nebula
horseshoe mounting
Horseshoe Nebula
horseshoe orbit
horst
hot Big Bang
hot dark matter
hot Jupiter
hot spot
1
2
hour angle
hour circle
Hourglass Nebula
howardite
Fred Hoyle
HPBW
->
half-power beamwidth
half-power beamwidth
->
beamwidth
HR diagram
->
Hertzsprung–Russell diagram
HR number
HSO
->
Herschel Space Observatory
HST
->
Hubble Space Telescope
H20 maser
H II region
Edwin Powell Hubble
Hubble classification
Hubble constant
Hubble diagram
Hubble flow
Hubble law
Hubble parameter
->
Hubble constant
Hubble radius
Hubble–Sandage variable
Hubble Space Telescope
Hubble's Variable Nebula
Hubble time
William Huggins
Hendrik ('Henk') Christoffel van de Hulst
Milton Lasell Humason
hummocky terrain
Humphreys series
Hungaria group
hunter's Moon
Huygenian eyepiece
Christiaan Huygens
Huygens Gap
Huygens probe
Hyades
Comet Hyakutake (C/1996 B2)
Hydra
hydrocarbon
hydrogen
hydrogen burning
hydrogen emission region
hydrogen ion
hydrogen line
->
21-centimetre line
hydrogen spectrum
hydrostatic equilibrium
hydroxyl
Hydrus
Hygiea
hyperbola
hyperbolic comet
hyperbolic orbit
hyperbolic velocity
hyperboloid
hyperfine structure
hypergiant star
Hyperion
hypernova
hyperon
hypersensitization
hypersthene achondrite
->
diogenite
hypervelocity impact
Hz
->
hertz
HZ43
I
Iapetus
IAU
->
International Astronomical Union
IC
->
Index Catalogue
Icarus
ICE
->
International Cometary Explorer
ICRF
->
International Celestial Reference Frame
ICRS
->
International Celestial Reference System
Ida
IGM
->
intergalactic medium
igneous
IGY
->
International Geophysical Year
Comet Ikeya–Seki (C/1965 S1)
Comet Ikeya–Zhang (153P/)
illuminance
IMAGE
->
Imager for Magnetopause-to-Aurora Global Exploration
image intensifier
->
image tube
Image Photon Counting System
Imager for Magnetopause-to-Aurora Global Exploration
image tube
imaging photometer
->
area photometer
I magnitude
Imbrium Basin
immersion
impact crater
impactite
impersonal astrolabe
->
Danjon astrolabe
inclination
1
2
Index Catalogue
indochinite
Indus
inequality
inert gas
->
noble gas
inertial coordinate system
inertial mass
inertial reference frame
infall velocity
inferior conjunction
inferior planet
inflationary universe
Infrared Astronomical Satellite
infrared astronomy
infrared cirrus
infrared excess
infrared photometry
infrared radiation
infrared source
Infrared Space Observatory
infrared telescope
infrared window
initial mass function
Robert Thorburn Ayton Innes
Innisfree meteorite
insolation
instability strip
Institut de Radio Astronomie Millimétrique
INT
->
Isaac Newton Telescope
INTEGRAL
->
International Gamma-Ray Astrophysics Laboratory
integrated magnitude
integration time
intensity
intensity interferometer
interacting binary
interacting galaxy
Interamnia
interference
1
2
interference filter
interference pattern
interferometer
intergalactic absorption
intergalactic magnetic field
intergalactic medium
intermediate-band photometry
intermediate-population star
intermediate-type star
International Astronomical Union
International Atomic Time
International Celestial Reference Frame
International Celestial Reference System
International Cometary Explorer
International Date Line
International Gamma-Ray Astrophysics Laboratory
International Geophysical Year
International Sun–Earth Explorer
International Sunspot Number
International Ultraviolet Explorer
International Years of the Quiet Sun
interplanetary matter
interplanetary scintillation
interpulse
interstellar absorption
interstellar maser
interstellar matter
interstellar molecule
interstellar reddening
->
interstellar absorption
interstellar scintillation
interstellar wind
intrinsic colour index
intrinsic variable
invariable plane
inverse Compton effect
inverse Compton scattering
->
inverse Compton effect
inverse P Cygni profile
->
P Cygni profile
inverse-square law
inversion layer
->
atmospheric transparency
Io (moon)
iodine cell
ion
ionization
ionization equilibrium
ionization front
ionization potential
ionization temperature
ionopause
ionosphere
ionospheric scintillation
ion tail
->
cometary tail
Iota Aquarid meteors
IPCS
->
Image Photon Counting System
IQSY
->
International Years of the Quiet Sun
IR
->
infrared
IRAM
->
Institut de Radio Astronomie Millimétrique
IRAS
->
Infrared Astronomical Satellite
Comet IRAS–Araki–Alcock (C/1983 H1)
Iris (asteroid)
iron meteorite
iron peak
irradiance
irradiation
1
2
irregular galaxy
irregular variable
IRTF
->
NASA Infrared Telescope Facility
Isaac Newton Group
Isaac Newton Telescope
ISEE
->
International Sun–Earth Explorer
Ishtar Terra
ISM
->
interstellar matter
->
interstellar medium
ISO (observatory)
->
Infrared Space Observatory
isochron
isochrone
isophotal wavelength
isophote
isotherm
isothermal process
isothermal region
isotope
isotropy
IUE
->
International Ultraviolet Explorer
Izar
J
James Clerk Maxwell Telescope
James Webb Space Telescope
jansky
Karl Guthe Jansky
(Pierre) Jules César Janssen
Janus (moon)
JCMT
->
James Clerk Maxwell Telescope
JD
->
Julian Date
James Hopwood Jeans
Jeans length
Jeans mass
jet (astronomical objects)
Jet Propulsion Laboratory
Jewel Box
Jilin meteorite
J magnitude
Job's Coffin
Jodrell Bank Observatory
Johnson photometry
Johnson Space Center
Joint Astronomy Centre
Harold Spencer Jones
joule
Jovian planet
JPL
->
Jet Propulsion Laboratory
Julian calendar
Julian Date
Julian day number
Julian epoch
Juliet (moon)
Juno (asteroid)
Jupiter (planet)
Jupiter–family comet
JWST
->
James Webb Space Telescope
K
K
->
kelvin scale
Immanuel Kant
Kappa Crucis Cluster
->
Jewel Box cluster
Kappa Cygnid meteors
kappa mechanism
Jacobus Cornelius Kapteyn
Kapteyn Selected Areas
Kapteyn's Star
Kaus Australis
K corona
K-correction
Keck Telescopes
Keeler Gap
Kellner eyepiece
Lord (William Thomson) Kelvin
Kelvin–Helmholtz contraction
->
Helmholtz–Kelvin contraction
kelvin scale
Kennedy Space Center
Kepler (satellite)
Johannes Kepler
Johann Kepler
->
Johannes Kepler
Keplerian telescope
Kepler's equation
Kepler's laws
Kepler's Star
Kerr black hole
Keyhole Nebula
Keystone
Kids (asterism)
kinematic parallax
kinetic energy
kinetic temperature
Gustav Robert Kirchhoff
Kirchhoff's laws
Kirin meteorite
->
Jilin meteorite
Daniel Kirkwood
Kirkwood gaps
Kitt Peak National Observatory
Kleinmann–Low Nebula
KL Nebula
->
Kleinmann–Low Nebula
K line
->
H and K lines
K magnitude
knife-edge test
->
Foucault test
Kochab
Comet Kohoutek (C/1973 E1)
König eyepiece
->
Erfle eyepiece
Koronis family
KPNO
->
Kitt Peak National Observatory
Kracht group
Kramers opacity
KREEP
Kreutz sungrazer
Kron–Cousins RI photometry
Kruskal diagram
K star
Kueyen
Gerard Peter Kuiper
Kuiper Airborne Observatory
Kuiper Belt
L
labes
labyrinthus
Nicolas Louis de Lacaille
Lacerta
Lacertid
->
BL Lacertae object
lacus
Lagoon Nebula
Joseph Louis de Lagrange(-Tournier)
Lagrangian point
l'Aigle meteorite shower
Joseph Jérôme (Le Français) de Lalande
Lalande 21185
Lambda Boötis star
Lambda Eridani star
La Palma
->
Roque de los Muchachos Observatory
Pierre Simon de Laplace
Laplacian plane
Large Binocular Telescope
Large Magellanic Cloud
Large Millimeter Telescope
large-scale structure
Large Synoptic Survey Telescope
Larissa
Las Campanas Observatory
laser
Laser Interferometer Space Antenna
La Silla Observatory
William Lassell
Lassell ring
last contact
last quarter
La Superba
late heavy bombardment
late-type galaxy
late-type star
latitude
latitude variation
LBV
->
luminous blue variable
L dwarf
leap second
leap year
least circle of confusion
->
astigmatism
->
spherical aberration
Henrietta Swan Leavitt
Leda (moon)
Georges Édouard Lemaître
Lemaître universe
lens
Lense–Thirring effect
->
frame dragging
gravitational lens
lenticula
lenticular galaxy
Leo (constellation)
Leo Minor (constellation)
Leonid meteors
lepton
lepton era
Lepus
Leto family
Urbain Jean Joseph Le Verrier
<->
Urbain Jean Joseph Leverrier
Le Verrier Ring
Comet Lexell (D/1770 L1)
LHA
->
local hour angle
Libra (constellation)
first point of Libra
libration
libration point
->
Lagrangian point
Lick Observatory
light
speed of light
light bucket
->
flux collector
light cone
light-curve
light pollution
light pressure
->
radiation pressure
light time
light year
limb
limb brightening
limb darkening
limiting magnitude
1
2
Lincoln Near-Earth Asteroid Research
Bertil Lindblad
Lindblad resonance
linea
LINEAR
line blanketing
line broadening
line of apsides
line of inversion
->
magnetic inversion line
line of nodes
line profile
liner
line ratio
line receiver
line spectrum
linewidth
line wing
lingula
LISA
->
Laser Interferometer Space Antenna
LISA Pathfinder
Lissajous orbit
lithium star
lithosiderite
->
stony-iron meteorite
lithosphere
Little Dipper
Little Dumbbell
Liverpool Telescope
L magnitude
LMC
->
Large Magellanic Cloud
LMT
->
Large Millimeter Telescope
lobate ridge
lobate scarp
lobe
1
2
local arm
local bubble
Local Group
local hour angle
local mean time
local sidereal time
local standard of rest
local supercluster
local thermodynamic equilibrium
local time
Lockman hole
(Joseph) Norman Lockyer
lodranite
LOFAR
->
Low Frequency Array
LONEOS
->
Lowell Observatory Near-Earth Object Search
long-baseline interferometry
longitude
longitude at the epoch
longitude of perigee
longitude of perihelion
longitude of the ascending node
long-period comet
long-period variable
lookback time
loop prominence
Lorentz–Fitzgerald contraction
Lorentz transformation
Lost City meteorite
(Alfred Charles) Bernard Lovell
Lovell Telescope
Percival Lowell
Lowell Observatory
Lowell Observatory Near-Earth Object Search
lower culmination
Low Frequency Array
low-luminosity star
low-mass star
low surface brightness galaxy
low-velocity star
LRO
->
Lunar Reconnaissance Orbiter
LSR
->
local standard of rest
LSST
->
Large Synoptic Survey Telescope
LST
->
local sidereal time
LTP
->
lunar transient phenomenon
luminosity
luminosity class
luminosity evolution
->
galaxy evolution
luminosity function
luminosity–volume test
luminous arc
luminous blue variable
Luna (Moon probes)
lunar eclipse
lunar inequality
Lunar Module
Lunar Orbiter
lunar parallax
Lunar Prospector
Lunar Reconnaissance Orbiter
lunar theory
->
lunar inequality
lunar transient phenomenon
lunation
Knut Emil Lundmark
lunisolar precession
lunitidal interval
Lunokhod
Lupus
Lutz–Kelker bias
Willem ('William') Jacob Luyten
l.y.
->
light year
Lydia family
Lyman-α forest
Lyman-break Galaxy
Lyman limit
Lyman series
Lynx (constellation)
Bernard Ferdinand Lyot
Lyot filter
->
birefringent filter
Lyra (constellation)
Lyrid meteors
Lysithea
M
m
->
apparent magnitude
M
->
Messier Catalogue
M
->
absolute magnitude
MACHO
Mach's principle
macrospicules
macroturbulence
macula
Maffei Galaxies
Magdalena Ridge Observatory
Magellan
Magellanic Clouds
Magellanic Stream
Magellan Telescopes
magma
magnetar
magnetic inversion line
magnetic monopole
magnetic star
magnetic storm
->
geomagnetic storm
magnetic variable
magnetobremsstrahlung
magnetogram
magnetohydrodynamics
magnetopause
magnetosheath
magnetosphere
magnetotail
magnification
magnitude
magnitude of an eclipse
main beam
main-belt asteroid
->
asteroid belt
main lobe
->
main beam
main sequence
major axis
Maksutov telescope
Malin-1
Malmquist bias
manganese–mercury star
->
mercury–manganese star
manganese star
mantle
many-body problem
->
n-body problem
mare (astronomy)
Maria family
Mariner
Mariner Valley
->
Valles Marineris
Markab
Markarian galaxy
Mars (planet)
Marsden group
Mars Exploration Rover
Mars Express
Mars Global Surveyor
Marshall Space Flight Center
Mars Odyssey (2001 Mars Odyssey)
Mars Pathfinder
Mars probes
Mars Reconnaissance Orbiter
mascon
maser
maser amplifier
maser source
Nevil Maskelyne
mass
mass defect
mass discrepancy
mass function
mass loss
mass–luminosity relation
mass–radius relation
mass ratio
mass-to-light ratio
mass transfer
John Cromwell Mather
matter era
Mauna Kea Observatories
(Edward) Walter Maunder
Maunder minimum
maximum-entropy method
James Clerk Maxwell
Maxwell Gap
Maxwell Montes
Maxwell Telescope
->
James Clerk Maxwell Telescope
Mayall Telescope
McDonald Observatory
McIntosh scheme
->
sunspot
M-class asteroid
McMath–Pierce Solar Telescope
MDM Observatory
mean anomaly
mean daily motion
mean density of matter
mean equator
mean equinox
mean motion
mean parallax
->
statistical parallax
mean place
mean pole
mean position
->
mean place
mean sidereal time
mean solar day
mean solar time
mean sun
mean time
medium-band photometry
megamaser
megaregolith
Megrez
Melipal
meniscus lens
meniscus Schmidt telescope
Menkalinan
Menkar
Mensa (constellation)
mensa (planets)
Donald Howard Menzel
Merak
Mercury
mercury-manganese star
Mercury Surface, Space Environment, Geochemistry, and Ranging
celestial meridian
terrestrial meridian
meridian angle
meridian astronomy
meridian circle
meridian passage
->
meridian transit
meridian telescope
->
meridian circle
->
transit circle
->
transit instrument
meridian transit
MERLIN
->
Multi-Element Radio-Linked Interferometer Network
meson
mesopause
mesosiderite
mesosphere
MESSENGER
->
Mercury Surface, Space Environment, Geochemistry, and Ranging
Charles Joseph Messier
Messier Catalogue
Me star
metagalaxy
metal
metallic hydrogen
metal-poor star
metal-rich star
metastable state
meteor
Meteor Crater
meteorite
meteoroid
meteor shower
meteor storm
meteor stream
meteor swarm
methanol maser
Metis
Metonic cycle
Meudon Observatory
Meyer group
MHD
->
magnetohydrodynamics
Miaplacidus
Mice (galaxies)
Albert Abraham Michelson
Michelson interferometer
Michelson–Morley experiment
Michelson stellar interferometer
->
stellar interferometer
microchannel plate detector
microdensitometer
microlensing
micrometeorite
micrometer (measuring instrument)
micrometre
micron
micropore optics
Microscopium (constellation)
microturbulence
Microvariability and Oscillations of Stars
microvariable
microwave background radiation
microwaves
Midcourse Space Experiment
Mie scattering
Milky Way
millimetre-wave astronomy
millimetre waves
millisecond pulsar
Mills cross
Edward Arthur Milne
Milne–Eddington approximation
Mimas (moon)
Mimosa
->
Beta Crucis
Hermann Minkowski
Rudolph Leo Bernhard Minkowski
minor axis
minor planet
->
asteroid
Minor Planet Center
Mintaka
minute
minute of arc
<->
arcmin
Mira
Mirach
Miranda (moon)
Mira star
Mirphak
mirror
mirror blank
Mirzam
missing mass
Maria Mitchell
Mittenzwey eyepiece
mixing ratio
Mizar
MJD
->
Modified Julian Date
MK classification
->
Morgan–Keenan classification
MKK classification
->
Morgan–Keenan classification
M magnitude
MMT Observatory
mock Moon
->
parselene
mock Sun
->
parhelion
Modified Julian Date
moldavite
molecular cloud
molecular hydrogen
molecular line
molecule
Molonglo Radio Observatory
moment of inertia
MONET
->
Monitoring Network of Telescopes
Monitoring Network of Telescopes
monocentric eyepiece
Monoceros (constellation)
monochromatic light
monochromatic magnitude
monochromator
Monogem Ring
monopole
->
magnetic monopole
mons (planets)
month
Monthly Notices of the Royal Astronomical Society
Mont Mégantic Observatory
->
Observatoire du Mont-Mégantic
Moon
Mopra Observatory
Moreton wave
William Wilson Morgan
Morgan–Keenan classification
Morgan's classification
morning star
MOST
->
Microvariability and Oscillations of Stars
mottles
Mount Graham International Observatory
mounting
Mount Palomar Observatory
->
Palomar Observatory
Mount Stromlo and Siding Spring Observatories
Mount Wilson classification
->
sunspot
Mount Wilson Observatory
moustache
->
Ellerman bomb
moving cluster
MRAO
->
Mullard Radio Astronomy Observatory
M region
MRO
->
Magdalena Ridge Observatory
MSSSO
->
Mount Stromlo and Siding Spring Observatories
MS star
1
2
M star
MSX
->
Midcourse Space Experiment
Mu Cephei star
Mullard Radio Astronomy Observatory
Johann Müller
->
Regiomontanus
multi-beam receiver
Multi-Element Radio-Linked Interferometer Network
multiple star
multiplet
multi-ringed basin
->
impact basin
multiverse
muon
mural circle
Musca (constellation)
N
nadir
Nagler eyepiece
Naiad
Nal detector
naked eye
naked singularity
nakhlite
Nançay Radio Astronomy Observatory
nanometre
Naos
narrow-band photometry
NASA
->
National Aeronautics and Space Administration
NASA Infrared Telescope Facility
Nasir Eddin
->
al-Tusi
Nasser Eddin
->
al-Tusi
Nasmyth focus
National Aeronautics and Space Administration
National Astronomy and Ionosphere Center
->
Arecibo Observatory
National Optical Astronomy Observatory
National Radio Astronomy Observatory
National Solar Observatory
National Space Science Data Center
The Nautical Almanac
nautical twilight
n-body problem
NEA
->
near-Earth asteroid
neap tide
near-Earth asteroid
Near-Earth Asteroid Tracking
near infrared
NEAR Shoemaker
near ultraviolet
NEAT
->
Near-Earth Asteroid Tracking
nebula
nebula filter
nebular line
nebular variable
nebulosity
negative eyepiece
negative lens
->
diverging lens
Neptune (planet)
Nereid (moon)
Neumann lines
neutral hydrogen
neutral hydrogen line
->
21-centimetre line
neutral point
neutrino
neutrino astronomy
neutron
neutron degeneracy
neutron star
Simon Newcomb
New General Catalogue
New Horizons
New Millennium Program
new Moon
New Style date
New Technology Telescope
newton
Isaac Newton
Newtonian–Cassegrain telescope
Newtonian focus
Newtonian telescope
Newton's law of gravitation
Newton's laws of motion
N galaxy
NGC
->
New General Catalogue
nickel–iron meteorite
->
iron meteorite
Nicol prism
nightglow
->
airglow
night sky brightness
night vision
Nix Olympica
->
Olympus Mons
NLC
->
noctilucent clouds
nm
->
nanometre
N magnitude
NOAO
->
National Optical Astronomy Observatory
Nobeyama Radio Observatory
noble gas
noctilucent clouds
nocturnal
nodal line
node
nodical month
->
draconic month
non-baryonic matter
non-gravitational force
non-radial pulsation
non-thermal radiation
Nordic Optical Telescope
Norma (constellation)
normal astrograph
North America Nebula
Northern Coalsack
->
Great Rift
Northern Cross
->
Cygnus (constellation)
northern lights
->
aurora (astronomy)
North Galactic Spur
north polar distance
North Polar Sequence
North Star
->
Polaris
nova
nova-like variable
NPD
->
north polar distance
NRAO
->
National Radio Astronomy Observatory
NS
->
New Style date
NSO
->
National Solar Observatory
NSSDC
->
National Space Science Data Center
N star
->
carbon star
NTT
->
New Technology Telescope
Nubecula Major
->
Magellanic Clouds
Nubecula Minor
->
Magellanic Clouds
nuclear fusion
nuclear reaction
nuclear time-scale
nucleon
nucleosynthesis
atomic nucleus
cometary nucleus
galactic nucleus
null geodesic
number evolution
->
galaxy evolution
Nunki
nutation
nutation in right ascension
->
equation of the equinoxes
Nysa family
O
OAO
->
Orbiting Astronomical Observatory
OB association
Oberon
object glass
objective
objective grating
objective prism
oblateness
oblate spheroid
->
spheroid
oblique rotator
obliquity of the ecliptic
Observatoire du mont Mégantic
observatory
occultation
occulting bar
occulting disk
oceanus
OC star
octahedrite
Octans (constellation)
ocular
->
eyepiece
Oe star
off-axis guider
Of star
o.g.
->
object glass
OH–IR source
OH line
OH maser
OHP
->
Haute-Provence Observatory
Heinrich Wilhelm Matthäus Olbers
Olbers' paradox
Old Style date
Oljato (asteroid)
Olympus Mons
O magnitude
Omega Centauri
Omega Nebula
Onsala Space Observatory
ON star
Jan Hendrik Oort
Oort Cloud
Oort's constants
Oosterhoff group
Ootacamund Radio Astronomy Centre
opacity
open cluster
open universe
Ophelia (moon)
Ophiuchid meteors
Ophiuchus (constellation)
Ernst Julius Öpik
Oppenheimer–Volkoff limit
Opportunity (Mars rover)
opposition (astronomy)
opposition effect
optical axis
optical depth
optical double
optical flat
optical glass
optical interferometer
optical libration
optical pathlength
optical pulsar
optical thickness
->
optical depth
optical wedge
optics
orbit
orbital elements
orbital velocity
Orbiting Astronomical Observatory
Orbiting Solar Observatory
ordinary chondrite
organic molecule
Orgueil meteorite
Orientale Basin
Orion (constellation)
Orion Arm
Orion Association
Orionid meteors
Orion Molecular Clouds
Orion Nebula
Orion Spur
Orion variable
ORM
->
Roque de los Muchachos Observatory
orrery
orthoscopic eyepiece
OS
->
Old Style date
oscillating universe
osculating elements
osculating orbit
OSO
->
Orbiting Solar Observatory
O star
OT
->
Teide Observatory
outgassing
1
2
overcontact binary
oversampling
overshooting
overtone mode
OVV quasar
->
optically violently variable quasar
->
blazar
Owens Valley Radio Observatory
Owl Nebula
oxygen burning
ozonosphere
P
PA
->
position angle
PAH
->
polycyclic aromatic hydrocarbon
pair annihilation
pair production
palimpsest
Pallas (asteroid)
pallasite
Palomar Observatory
Palomar Observatory Sky Survey
palus
Pan (moon)
Pandora (moon)
Pan-STARRS
parabola
parabolic antenna
parabolic comet
parabolic orbit
parabolic velocity
paraboloid
parallactic angle
parallactic ellipse
parallactic inequality
parallactic motion
parallax
parametric amplifier
Paranal Observatory
paraxial
parent isotope
parfocal
parhelion
Paris Observatory
Parkes Observatory
parsec
parselene
William Parsons
->
Third Earl of Rosse
partial eclipse
particle
->
elementary particle
pascal (unit)
Paschen–Back effect
Paschen series
Pasiphae (moon)
passband
past light cone
->
light cone
patera
pathlength
->
optical pathlength
Paul Wild Observatory
Pavo (constellation)
Cecilia Helena Payne-Gaposchkin
pc
->
parsec
P-class asteroid
P Cygni line profile
P Cygni star
->
S Doradus star
Peacock (star)
peculiar galaxy
peculiar motion
peculiar star
peculiar velocity
pedestal crater
Peekskill meteorite
Pegasus (constellation)
Pele
Pelican Nebula
Penrose process
penumbra
1
2
penumbral eclipse
Arno Allan Penzias
perfect cosmological principle
peri-
periapsis
periastron
periastron effect
pericentre
perigee
perihelion
time of perihelion passage
orbital period
period–age relation
period–colour relation
period–density relation
periodic comet
periodic orbit
periodic perturbation
period–luminosity–colour relation
period–luminosity relation
period–mass relation
period–radius relation
period–spectrum relation
Perseid meteors
Perseus (constellation)
Perseus A
Perseus Arm
Perseus Cluster
personal equation
perturbation
Petzval surface
Pfund series
PHA
->
Potentially Hazardous Asteroid
Phad
Phaethon (asteroid)
phase
1
2
phase angle
phased array
phase defect
phase diagram
phase difference
phase rotator
phase-switching interferometer
phase transition
->
inflationary universe
Phecda
->
Phad
Pherkad
Phillips bands
Phobos (moon)
Phobos probes
Phocaea group
Phoebe (moon)
Phoenicid meteors
Phoenix (constellation)
Phoenix (Mars lander)
Pholus (asteroid)
photino
photocathode
photocell
->
photoelectric cell
photocentre
1
2
photoconductive cell
photodissociation
photodissociation region
photoelectric cell
photoelectric magnitude
photoelectric photometer
photographic amplification
photographic emulsion
photographic magnitude
photographic zenith tube
photoheliograph
photoionization
photometer
photometric binary
photometric parallax
photometric standard
->
standard star
photometry
photomultiplier
photon
photon sphere
photopolarimeter
->
polarimeter
photosphere
photovisual magnitude
photovoltaic detector
physical albedo
->
geometrical albedo
physical double
physical libration
Giuseppe Piazzi
Pic du Midi Observatory
Edward Charles Pickering
William Henry Pickering
Pickering Series
Pico Veleta
Pictor (constellation)
pincushion distortion
Pinwheel Galaxy
pion
Pioneer
Pioneer Venus
Pipe Nebula
Pisces (constellation)
Piscid meteors
Piscis Austrinid meteors
Piscis Austrinus (constellation)
pitch angle
pixel
plage
Planck (spacecraft)
Planck constant
Planck era
Planck's law
planemo
planet
planetarium
planetary aberration
planetary aspect
->
aspect
planetary migration
planetary nebula
planetary precession
planetesimal
planetoid
->
asteroid
->
Giuseppe Piazzi
planetology
planisphere
planitia
planoconcave lens
planoconvex lens
planum
John Stanley Plaskett
Plaskett's Star
plasma
plasmapause
plasmasphere
plasma tail
->
cometary tail
Plateau de Bure
plate centre
plate constants
plate-measuring machine
plate scale
plate tectonics
Platonic year
PLC relation
->
period–luminosity–colour relation
Pleiades
plerion
Plössl eyepiece
Plough (asterism)
PL relation
->
period–luminosity relation
plume
1
2
Plutino
Pluto
P magnitude
Pockels cell
Norman Robert Pogson
Pogson ratio
Pogson scale
Pogson step method
(Jules) Henri Poincaré
Pointers
point source
point-spread function
polar
->
AM Herculis star
->
DQ Herculis star
polar axis
polar cap
polar diagram
polar distance
polar flattening
polarimeter
polarimetry
->
polarization
Polaris
polarization
polar motion
polar orbit
polar plume
->
coronal plume
polar ring galaxy
polar sequence
polar wandering
pole
pole star
Pollux
polycyclic aromatic hydrocarbon
John Pond
Jean Louis Pons
stellar population
Population I
Population II
Population III
pore
Porrima
Porro prism
Portia (moon)
positional astronomy
->
astrometry
->
meridian astronomy
position angle
position-angle effect
position circle
position micrometer
->
filar micrometer
positive lens
->
converging lens
POSS
->
Palomar Observatory Sky Survey
post-nova
potassium–argon method
potential hazardous asteroid
power spectrum
Poynting–Robertson effect
PPM Star Catalogue
p-process
Praesepe
preceding
precession
precession constant
precession of the equinoxes
precursor pulse
pre-nova
pressure broadening
Príbram meteorite
primary cosmic ray
primary minimum
primary mirror
prime focus
prime meridian
prime vertical
primordial fireball
primordial galaxy
Principia
principle of equivalence
->
equivalence principle
prism
prismatic astrolabe
probable error
Procyon
prograde motion
->
direct motion
prolate spheroid
->
spheroid
Prometheus (moon)
prominence
prominence spectroscope
promontorium
proper motion
proper time
proplyd
proportional counter
Prospero (moon)
Proteus (moon)
protogalaxy
proton
proton–proton reaction
protoplanet
protoplanetary nebula
1
2
protostar
protosun
Proxima Centauri
p-spot
Ptolemaic system
Ptolemy
<->
Claudius Ptolemaeus
Publications of the Astronomical Society of the Pacific
Puck (moon)
Pulcherrima
->
Izar
pulsar
pulsating variable
pulsation mode
pulse broadening
pulse profile
pulse width
Pup (Sirius B)
pupil
Puppid–Velid meteors
Puppis (constellation)
Purkinje effect
PV Telescopii star
Pyxis
PZT
->
photographic zenith tube
Q
Q-class asteroid
Q magnitude
QSO
->
quasi-stellar object
QSS
->
quasi-stellar radio source
quadrant
Quadrantid meteors
quadrature
quadrupole
quantum
quantum cosmology
quantum efficiency
quantum gravitation
quantum theory
Quaoar
quark
quark star
quasar
quasi-stellar object
quasi-stellar radio source
quiescent prominence
quiet sun
quintessence
->
dark energy
R
RA
->
right ascension
radar astronomy
radar meteor
radial pulsation
radial velocity
radial-velocity spectrometer
radian
radiant
radiation
radiation belt
radiation era
radiation laws
->
Planck's law
->
Stefan–Boltzmann law
->
Wien's displacement law
radiation pressure
radiation temperature
radiative equilibrium
radiative recombination
->
free–bound transition
radiative transfer
radiative zone
radioactive age dating
radio astrometry
RadioAstron
radio astronomy
radio galaxy
radiogenic
radioheliograph
radio interferometer
radio jet
->
jet (astronomy)
radio meteor
radiometer
radiometric dating
->
radioactive age dating
radionuclide
radio source
radio star
radio telescope
radio waves
radio window
radius–luminosity relation
radius of curvature
radius vector
Raman effect
Ramaty High-Energy Solar Spectroscopic Imager
rampart crater
Ramsden disk
Ramsden eyepiece
Ranger (Moon probes)
RAS
->
Royal Astronomical Society
Rasalgethi
Rasalhague
Ra-Shalom (asteroid)
R association
raster
raster scan
RAS thread
RATAN-600
Rayleigh criterion
Rayleigh–Jeans formula
Rayleigh limit
->
Rayleigh criterion
Rayleigh number
Rayleigh scattering
crater rays
R Canis Majoris star
R-class asteroid
R Coronae Borealis star
Grote Reber
receiver
1
2
reciprocity failure
recombination
recombination epoch
recombination line
rectangular coordinates
recurrent nova
recycled pulsar
reddening
red dwarf
red giant
Red Planet
->
Mars (planet)
redshift
redshift–distance relation
redshift–magnitude relation
Red Spot
->
Great Red Spot
reduced proper motion
red variable
reference frame
->
frame of reference
reference star
reflectance spectrum
reflecting telescope
reflection effect
reflection grating
reflection nebula
reflection variable
reflector
->
reflecting telescope
refracting telescope
atmospheric refraction
refractive index
refractor
->
refracting telescope
refractory
regio
Regiomontanus
regmaglypt
regolith
regression of nodes
Regulus
relative orbit
relative sunspot number
relativistic beaming
relativistic velocity
relativity
relaxation time
remote sensing
réseau
residuals
resolution
->
resolving power
resolving power
resonance
resonance line
resonant scattering
rest mass
restricted three-body problem
retardation
retardation plate
->
wave plate
reticle
Reticulum (constellation)
reticulum (planets)
retrograde motion
reversing layer
revolution
RFT
->
richest-field telescope
RGO
->
Royal Greenwich Observatory
RGU photometry
Rhea (moon)
RHESSI
->
Ramaty High-Energy Solar Spectroscopic Imager
Rho Cassiopeiae star
Rho Ophiuchi Nebula
Richardson–Lucy algorithm
richest-field telescope
Rigel
right ascension
Rigil Kentaurus
->
Alpha Centauri
rille (Moon)
rima
planetary ring
ring arcs
ring galaxy
Ring Nebula
rise time
rising
George Willis Ritchey
Ritchey–Chrétien telescope
R magnitude
Robertson–Walker metric
Roche limit
Roche lobe
ROE
->
Royal Observatory, Edinburgh
Ole Christensen Römer
Olaus Christensen Römer
->
Ole Christensen Römer
Ronchi test
Rood–Sastry type
roof prism
Roque de los Muchachos Observatory
Rosalind (moon)
Rosat
Rosetta
Rosette Nebula
Frank Elmore Ross
Third Earl of Rosse
<->
William Parsons
Rosseland mean opacity
Bruno Benedetto Rossi
Rossiter effect
Rossi X-ray Timing Explorer
rotating variable
rotation
rotation curve
rotation effect
->
Rossiter effect
rotation measure
Royal Astronomical Society
Royal Greenwich Observatory
Royal Observatory, Edinburgh
r-process
RR Lyrae star
RRs variable
->
Delta Scuti star
RR Telescopii star
RS Canum Venaticorum star
R star
->
carbon star
Rubin–Ford effect
runaway star
rupes
Henry Norris Russell
Russell–Vogt theorem
->
Vogt–Russell theorem
RV Tauri star
RW Aurigae star
RXTE
->
Rossi X-ray Timing Explorer
Martin Ryle
Ryle Telescope
S
SAAO
->
South African Astronomical Observatory
Sabik
Sachs–Wolfe effect
Sacramento Peak Observatory
Carl Edward Sagan
Sagitta (constellation)
Sagittarius (constellation)
Sagittarius A
Sagittarius Arm
Sagittarius Dwarf Galaxy
Saha ionization equation
Sakigake
Salpeter function
->
initial mass function
Salpeter process
->
triple-alpha process
SALT
->
South African Large Telescope
SAMPEX
->
Solar, Anomalous, and Magnetospheric Particle Explorer
Allan Rex Sandage
SAO
->
Smithsonian Astrophysical Observatory
SAO Catalog
->
Smithsonian Astrophysical Observatory Star Catalog
saros
SAS
->
Small Astronomy Satellite
satellite
Saturn (planet)
Saturn Nebula
scale height
scattered-disk object
scatter ellipse
scattering
Scheat
Schechter function
Schedar
->
Shedir
Christoph Scheiner
Giovanni Virginio Schiaparelli
schiefspiegler telescope
Maarten Schmidt
Schmidt camera
Schmidt–Cassegrain telescope
Schönberg–Chandrasekhar limit
->
Chandrasekhar–Schönberg limit
Schröter effect
(Samuel) Heinrich Schwabe
Karl Schwarzschild
Schwarzschild black hole
Schwarzschild radius
Schwarzschild telescope
Comet 29P/Schwassmann–Wachmann 1
scintillation
scintillation counter
S-class asteroid
Sco-Cen Association
scopulus
Scorpius (constellation)
Scorpius X-1
Scotch mount
SC star
->
S star
SCT
->
Schmidt–Cassegrain telescope
Sculptor (constellation)
Sculptor group
Scutum (constellation)
SDO
->
Solar Dynamics Observatory
S Doradus star
SDSS photometry
Search for Extraterrestrial Intelligence
Seashell Galaxy
season
(Pietro) Angelo Secchi
Secchi classification
second
leap second
secondary cosmic ray
secondary crater
secondary minimum
secondary mirror
second contact
second of arc
secular
secular acceleration
secular parallax
secular perturbation
secular variable
seeing
segmented mirror
selected areas
->
Kapteyn Selected Areas
selective absorption
Selene (Moon probe)
selenology
self-absorption
semidetached binary
semidiameter
semi-forbidden line
->
forbidden line
semimajor axis
semiregular variable
sensitivity
separation
Serpens (constellation)
Serrurier truss
Setebos
SETI
->
Search for Extraterrestrial Intelligence
setting
setting circle
Seven Sisters
->
Pleiades
Sextans (constellation)
sextant
Carl Keenan Seyfert
Seyfert galaxy
Seyfert's Sextet
Shack–Hartmann test
->
Hartmann test
shadow bands
shadow transit
Shapiro delay
Harlow Shapley
Shapley Concentration
->
supercluster
shatter cone
Shaula
Shedir
shell burning
shell galaxy
shell star
shepherd moon
shergottite
shield volcano
shock metamorphism
Eugene Merle Shoemaker
Comet Shoemaker–Levy 9 (D/1993 F2)
shooting star
->
meteor
short-period comet
short-period variable
Sickle (asterism)
side lobe
sidereal
sidereal day
sidereal month
sidereal period
sidereal rate
sidereal time
sidereal year
siderite
->
iron meteorite
siderolite
->
stony-iron meteorite
siderophyre
siderostat
Siding Spring Observatory
Sigma Octantis
signal-to-noise ratio
->
sensitivity
Sikhote–Alin meteorite
silicon burning
silicon star
silvering
SIMBAD
SIM PlanetQuest
single-lined binary
singularity
Sinope (moon)
sinuous rille
sinus
SiO maser
Sirius
Sirrah
Willem de Sitter
SI units
six-colour system
61 Cygni
SKA
->
Square Kilometre Array
sky brightness
Skylab
Earl Carl Slipher
Vesto Melvin Slipher
Sloan Digital Sky Survey
slow nova
slow pulsator
SMA
->
Submillimeter Array
Small Astronomy Satellite
small circle
Small Magellanic Cloud
SMART-1
SMC
->
Small Magellanic Cloud
Smithsonian Astrophysics Observatory
Smithsonian Astrophysics Observatory Star Catalog
SMM
->
Solar Maximum Mission
George Fitzgerald Smoot III
SNC meteorites
SNR
->
supernova remnant
SNU
->
solar neutrino unit
SOAR
->
Southern Astrophysical Research telescope
SOFIA
->
Stratospheric Observatory for Infrared Astronomy
soft gamma-ray repeater
soft X-rays
SO galaxy
->
lenticular galaxy
SOHO
->
Solar and Heliospheric Observatory
Sojourner
Solar, Anomalous, and Magnetospheric Particle Explorer
solar activity
Solar and Heliospheric Observatory
solar antapex
solar apex
solar atmosphere
solar constant
solar cycle
->
sunspot cycle
solar day
Solar Dynamics Observatory
solar dynamo
solar eclipse
solar flare
solar interior
solar irradiance
solar mass
solar maximum
Solar Maximum Mission
solar minimum
solar motion
solar nebula
solar neutrino unit
Solar Orbiter
solar oscillations
->
helioseismology
solar parallax
Solar System
solar telescope
solar–terrestrial relations
Solar Terrestrial Relations Observatory
solar time
solar tower
solar wind
solar year
solid Schmidt telescope
solstice
solstitial colure
Sombrero Galaxy
Sothic cycle
source count
South African Astronomical Observatory
South Atlantic Anomaly
Southern African Large Telescope
Southern Astrophysical Research Telescope
Southern Cross
southern lights
Southern Reference Stars
Southern Sky Survey
South Pole Aitken Basin
curvature of space
->
curvature of spacetime
space motion
space probe
space reddening
->
interstellar absorption
Space Telescope Science Institute
spacetime
space velocity
Spacewatch
space weather
spallation
spark chamber
spec.
->
speculum metal
Special Astrophysical Observatory
special theory of relativity
speckle interferometry
spectral classification
spectral index
spectral line
spectral type
spectrogram
spectrograph
spectroheliogram
spectroheliograph
spectrohelioscope
spectrometer
spectrophotometer
spectrophotometry
spectropolarimetry
spectroscope
spectroscopic binary
spectroscopic parallax
spectroscopy
spectrum
1
2
spectrum binary
spectrum variable
->
Alpha2 Canum Venaticorum
speculum metal
Harold Spencer Jones
spherical aberration
spherical albedo
->
Bond albedo
spherical astronomy
spherical coordinates
spheroid
Spica
spicule
spider
spin
spinar
spin casting
Spindle Galaxy
spin-down
spin–orbit coupling
spin temperature
spiral arm
spiral galaxy
Spirit (Mars rover)
Lyman Spitzer, Jr
Spitzer Space Telescope
spokes
sporadic meteor
Gustav Friedrich Wilhelm Spörer
Spörer minimum
Spörer's law
spray
spring equinox
->
vernal equinox
Springfield mounting
spring tide
s-process
sputtering
Square Kilometre Array
Square of Pegasus
SS Cygni
SS Cygni star
SS433
S star
ST
->
standard time
standard atmosphere
standard epoch
standard solar model
standard star
standard time
standstill
star
starburst galaxy
star cluster
star count
Stardust
Stark broadening
starquake
starspot
star streaming
static limit
static universe
stationary point
1
2
statistical parallax
steady-state theory
Stefan–Boltzmann constant
Stefan–Boltzmann law
Stefan's law
->
Stefan–Boltzmann law
stellar association
stellar atmosphere
stellar evolution
stellar interferometer
stellar population
stellar structure
stellar wind
Stephano (moon)
Stephan's Quintet
step method
->
Argelander step method
->
Pogson step method
steradian
STEREO
->
Solar Terrestrial Relations Observatory
stereo comparator
Steward Observatory
stishovite
Stokes parameters
Stonyhurst heliographic coordinates
stony-iron meteorite
stony meteorite
stratigraphy
stratopause
stratosphere
Stratospheric Observatory for Infrared Astronomy
streamer
Strehl ratio
strewn field
1
2
string
->
cosmic string
Bengt Georg Daniel Strömgren
Strömgren photometry
Strömgren sphere
strontium star
Struve
Friedrich Georg Wilhelm von Struve
Otto Struve
Otto Wilhelm Struve
STScI
->
Space Telescope Science Institute
style
Subaru Telescope
subatomic particle
->
elementary particle
subdwarf
subgiant
subluminous star
sublunar point
Submillimeter Array
Submillimeter Wave Astronomy Satellite
submillimetre astronomy
sub-pulse
subsolar point
substellar object
substellar point
substorm
sudden ionospheric disturbance
Abd al-Raman al-Sufi
Suisei
sulcus
summer solstice
->
solstice
Summer Time
Summer Triangle
Sun
sundial
sundog
->
parhelion
Sunflower galaxy
sungrazer
->
Kreutz sungrazer
sunrise
sunset
sunskirter
sunspot
sunspot cycle
Sunyaev–Zel'dovich effect
supercluster
supergalactic plane
supergiant
supergiant elliptical
supergranulation
superheterodyne receiver
superhump
->
SU Ursae Majoris star
superior conjunction
superior planet
superluminal velocity
supermassive black hole
supermassive star
supermaximum
->
SU Ursae Majoris star
supernova
Supernova 1987A
supernova remnant
super-rotation
super-Schmidt telescope
superstring theory
supersynthesis
surface brightness
surface gravity
surface temperature
surge prominence
Surveyor (space probes)
SU Ursae Majoris star
Suzaku
S Vulpeculae star
Swan bands
Swan Nebula
->
Omega Nebula
SWAS
->
Submillimeter Wave Astronomy Satellite
Swift (satellite)
Comet 109P/Swift–Tuttle
Sword Hand of Perseus
Sword of Orion
SX Arietis star
SX Phoenicis star
Sycorax (moon)
symbiotic star
synchronous orbit
synchronous rotation
syndyname
synodic
synodic month
synodic period
Syrtis Major
Systems I, II, and III
syzygy
T
tachocline
tachyon
TAI
->
Temps Atomique International
->
International Atomic Time
cometary tail
tangential velocity
Tarantula Nebula
Tarazed
T association
Taurid meteors
Taurus
Taurus A
Taurus Molecular Clouds
Taurus Moving Cluster
Taurus X-1
TCB
->
Barycentric Coordinate Time
T-class asteroid
TDB
->
Temps Dynamique Barycentrique
->
Barycentric Dynamical Time
T dwarf
Teapot (asterism)
Comet Tebbutt (C/1861 J1)
technetium star
tectonics
Teide Observatory
tektite
telecompressor
tele-extender
telescope
telescope drive
->
drive
telescope mounting
->
mounting
Telescopio Nazionale Galileo
Telescopium (constellation)
Telesto
telluric lines
tellurium
Comet 55P/Tempel–Tuttle
temperature
temperature minimum
Tenma
termination shock
terminator
terra
terracing
terrestrial age
Terrestrial Dynamical Time
->
Terrestrial Time
terrestrial planet
Terrestrial Time
tesla
tessera
Tethys (moon)
Thalassa (moon)
Thales of Miletus
Tharsis Montes
Thebe (moon)
Themis family
Themisto (moon)
theory of everything
->
grand unified theory
thermal bremsstrahlung
->
free–free transition
thermal equilibrium
1
2
thermal radiation
thermocouple
thermodynamic equilibrium
->
thermal equilibrium
thermodynamic temperature
thermopile
thermosphere
thinned chip
Third Cambridge Catalogue
third contact
third quarter
->
last quarter
30 Doradus
->
Tarantula Nebula
Thirty Meter Telescope
tholus
William Thomson
->
Lord Kelvin
Thomson scattering
three-body problem
three-colour photography
->
astrophotography
three-colour photometry
->
Johnson photometry
three-kiloparsec arm
Thuban
Thule (asteroid)
tidal bulge
tidal evolution
tidal force
tidal friction
tidal heating
tides
time
time dilation
time of perihelion passage
time zone
TiO bands
tip–tilt mirror
Tisserand parameter
Titan (moon)
Titania (moon)
Titius–Bode law
->
Bode's law
TLP
->
lunar transient phenomenon
TMT
->
Thirty Meter Telescope
TNG
->
Galileo National Telescope
TNO
->
trans-Neptunian object
Toby Jug Nebula
Tolman test
Clyde William Tombaugh
topocentric
topocentric coordinates
Torino scale
Toro (asteroid)
torquetum
torus
total eclipse
totality
total magnitude
->
integrated magnitude
total solar irradiance
Toutatis (asteroid)
TRACE
->
Transition Region and Coronal Explorer
train (meteors)
transfer function
transfer lens
transfer orbit
transient lunar phenomenon
->
lunar transient phenomenon
meridian transit
planetary transit
transit circle
transit instrument
transition probability
transition region
Transition Region and Coronal Explorer
transmission grating
trans-Neptunian object
atmospheric transparency
transverse velocity
->
tangential velocity
Trapezium (star)
Triangulum (constellation)
Triangulum Australe (constellation)
Triangulum Galaxy
Trifid Nebula
trigonometric parallax
triple-alpha process
triplet (lens)
triquetrum
trischiefspiegler
->
schiefspiegler telescope
Triton (moon)
Trojan asteroid
tropic
tropical month
tropical period
tropical year
Tropic of Cancer
Tropic of Capricorn
tropopause
troposphere
true anomaly
true equator
true equinox
true pole
Trumpler classification
Trumpler star
TT
->
Terrestrial Time
T Tauri star
T Tauri wind
Tucana (constellation)
Tully–Fischer relation
Tunguska event
tuning-fork diagram
atmospheric turbulence
turnoff point
Nasir al-Din al-Tusi
Comet 41P/Tuttle–Giacobini–Kresák
21-centimetre line
twilight
twinkling
two-body problem
two-colour diagram
two-colour photometry
->
BV photometry
Two-Micron All-Sky Survey
two-spectrum binary
->
composite-spectrum binary
Tycho Brahe
Tycho Catalogue
Tychonic system
Tycho's Star
Type I supernova
->
supernova
Type II supernova
->
supernova
U
UBV photometry
->
Johnson photometry
UBVRIJKL photometry
->
Johnson photometry
U-class asteroid
U Geminorum star
Uhuru
UKIDSS
->
UKIRT Infrared Deep-Sky Survey
UKIDSS photometry
UKIRT
->
United Kingdom Infrared Telescope
UKIRT Infrared Deep-Sky Survey
UKST
->
United Kingdom Schmidt Telescope
ultra-compact dwarf galaxy
ultra-luminous infrared galaxy
ultraviolet astronomy
ultraviolet excess star
ultraviolet photometry
ultraviolet radiation
Ulugh Beg
Ulysses (spacecraft)
U magnitude
umbra
1
2
Umbriel (moon)
undae
undersampling
Undina family
unfilled aperture
unit distance
United Kingdom Infrared Telescope
United Kingdom Schmidt Telescope
Universal Time
Universe
unsharp masking
upper culmination
->
culmination
Upsilon Sagittarii star
Uranometria
Uranus
Urca process
ureilite
Harold Clayton Urey
Ursa Major
Ursa Major Moving Cluster
Ursa Minor
Ursid meteors
US Naval Observatory
USNO CCD Astrograph Catalog
UT
->
Universal Time
UTC
->
Universel Temps Coordonné
->
Coordinated Universal Time
Utopia Planitia
UU Herculis star
UV
->
ultraviolet
uvby system
->
Strömgren photometry
UV Ceti star
UV Persei star
UXor
->
UX Orionis star
UX Orionis star
UX Ursae Majoris star
V
vacuum energy
Valhalla (impact basin)
Valles Marineris
vallis
James Alfred Van Allen
Van Allen Belts
Van Biesbroeck's Star
Hendrik van de Hulst
van Maanen's Star
variable star
variation
1
2
variation of latitude
->
latitude variation
vastitas
Vatican Advanced Technology Telescope
VBLUW photometry
->
Walraven photometry
V-class asteroid
Vega (star)
Vega probes
Veil Nebula
Vela (constellation)
Vela pulsar
Vela Supernova Remnant
velocity curve
velocity dispersion
velocity–distance relation
Venera
Venus (planet)
Venus Express
VERITAS
->
Very Energetic Radiation Imaging Telescope Array System
vernal equinox
vertical circle
Very Energetic Radiation Imaging Telescope Array System
Very Large Array
Very Large Telescope
Very Long Baseline Array
very long baseline interferometry
very slow nova
->
RR Telescopii star
Very Small Array
Vesta (asteroid)
Viking (space probes)
VILGEN photometry
Vilnius photometry
violent relaxation
virga
Virginid meteors
Virgo (constellation)
Virgo A
Virgo Cluster
Virgo Supercluster
->
local supercluster
virial theorem
Virtual Observatory
virtual particle
Visible and Infrared Survey Telescope for Astronomy
VISTA
->
Visible and Infrared Survey Telescope for Astronomy
visual binary
visual magnitude
VLA
->
Very Large Array
VLBA
->
Very Long Baseline Array
VLBI
->
very long baseline interferometry
VLBI Space Observatory Programme
VLT
->
Very Large Telescope
V magnitude
Hermann Carl Vogt
Vogt–Russell theorem
void
Voigt profile
Volans
volatile
von Zeipel theorem
Voyager (space probes)
VSOP
->
VLBI Space Observatory Programme
Vulcan (hypothetical planet)
Vulpecula (constellation)
VV Cephei star
->
Zeta Aurigae star
VV Sculptoris star
W
walled plain
Walraven photometry
waning
Washington Double Star Catalog
Water Jar
water maser
->
H2O maser
water of hydration
wavefront
waveguide
wavelength
wavenumber
wave plate
waxing
WC star
->
Wolf–Rayet star
WDS
->
Washington Double Star Catalog
weber
weird terrain
Carl Friedrich von Weizsäcker
Werner lines
Comet West (C/1975 V1)
Westerbork Radio Observatory
Wezen
Fred Lawrence Whipple
Whipple Observatory
->
Fred Lawrence Whipple Observatory
Whirlpool Galaxy
whistler
white dwarf
white hole
white-light corona
WHT
->
William Herschel Telescope
Wide Field Infrared Survey Explorer
Widmanstätten pattern
Wielen dip
Wien's displacement law
Wild Duck Cluster
Wild's Triplet
Rupert Wildt
Wilkinson Microwave Anisotropy Probe
William Herschel Telescope
Robert Woodrow Wilson
Wilson–Bappu effect
Wilson effect
Comet 107P/Wilson–Harrington
WIMP
Wind (satellite)
winter solstice
->
solstice
WISE
->
Wide Field Infrared Survey Explorer
WIYN Telescope
WMAP
->
Wilkinson Microwave Anisotropy Probe
W. M. Keck Observatory
WN star
->
Wolf–Rayet star
Maximilian ('Max') Franz Joseph Cornelius
(Johann) Rudolf Wolf
Wolf diagram
Wolf–Lundmark–Melotte system
Wolf–Rayet star
Wolf sunspot number
Wolf 359
Wollaston prism
Wolter telescope
Richard van der Riet Woolley
world line
wormhole
Wright telescope
wrinkle ridge
WR star
->
Wolf–Rayet star
W Serpentis star
->
Algol star
W Ursae Majoris star
W Virginis star
Wyoming Infrared Observatory
WZ Sagittae star
X
XMM-Newton
X-ray astronomy
X-ray background
X-ray binary
X-ray bright point
->
coronal bright point
X-ray burst
X-ray calorimeter
X-ray nova
X-ray pulsar
X-rays
X-ray source
X-ray telescope
X-ray Timing Explorer
X-ray transient
XTE
->
Rossi X-ray Timing Explorer
XUV
->
extreme ultraviolet
Y
Yagi antenna
Yale Bright Star Catalogue
->
Bright Star Catalogue
Yarkovsky effect
Y dwarf
year
Yepun
Yerkes Observatory
Yerkes system
1
2
Y magnitude
Yohkoh
yoke mounting
YY Orionis star
Z
z
->
redshift
ZAMS
->
zero-age main sequence
Z Andromedae star
Zanstra method
ZC
->
Zodiacal Catalogue
Z Camelopardalis star
ZD
->
zenith distance
Zeeman effect
Zelenchukskaya
zenith
zenithal attraction
zenithal hourly rate
zenith distance
zenith telescope
zero-age horizontal branch
zero-age main sequence
Zeta Aurigae star
ZHR
->
zenithal hourly rate
zirconium star
->
S star
Z magnitude
zodiac
Zodiacal Catalogue
zodiacal dust
zodiacal light
Zond
zone catalogue
zone of avoidance
zone time
Zubenelgenubi
Zürich relative sunspot number
->
relative sunspot number
Fritz Zwicky
Zwicky Catalogue
ZZ Ceti star
Feature entries
active galactic nucleus
Big Bang theory
black hole
cosmic microwave background
cosmology
extrasolar planet
galaxy evolution
gamma-ray burst
nova
pulsar
quasar
redshift survey
Search for Extraterrestrial Intelligence
stellar evolution
supernova
time
Notes
The list might contain errors
When you click a red link, please check the spelling of the title before you create the article
1, 2 and 3 means that there exist more than one meaning of the term on the previous line
Sources
Ridpath, Ian (2007).
Oxford Dictionary of Astronomy
. Oxford University Press.
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