Astronomy

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  Andromeda and integrated flux nebulae (8)
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  California nebula (6)
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  Perseid meteor and Andromeda (4)
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  Gamma cas nebula (4)
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  Lion Nebula of Cepheus (4)
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  Flying Bat and Squid Nebulae (4)
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  2023 Annular Eclipse (3)
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  Starlink satellite over Mt. Rainier (3)
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  Supernova in the Pinwheel Galaxy (3)
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  Full moon (3)
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  Butterfly Nebula (2)
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  Heart Nebula (2)
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  Pacman nebula (2)
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  Starless Andromeda (2)
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  Aurora borealis over Fairbanks
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  Supermoon
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  Orion Nebula
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  2023 annular eclipse

General

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  Stool culture on agar (8)
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  Ice core drill head (4)
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  Fagradalsfjall volcanic eruption, close-up (3)
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  "Nature wins" (3)
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  Trilobite fossil and Alberta landscape (3)
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  Plasma in vacuum chamber (3)
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  Asperitas clouds (3)
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  Lightning strike (3)
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  Lightning over Goldendale, WA (2)
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  Nevis linear particle accelerator (2)
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  Chernobyl gas masks (2)
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  Chernobyl medical specimens (2)
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  Moaning Caverns (2)
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  Yosemite Falls (2)
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  Wind turbines in fog (2)
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  Fagradalsfjall volcanic eruption, wide shot
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  Human hair diffraction
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  Within the greenery
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  Lake and sky
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  Amateur rocket launch
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  Skylab coupling connector
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  Waterways in Charleston, South Carolina
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  Mississippian cross-bedded sandstone

People

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  Vortex draining (8)
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  Antarctic snow pit (8)
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  Fritz Goro at work (7)
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  WAIS Divide ice core I (5)
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  WAIS Divide ice core II (5)
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  Catching frogs and salamanders in Nebraska (3)
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  Teamwork in high school science (2)
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  Geologists in Alberta (2)
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  Randall Munroe
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  Fritz Goro

Microscopy

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  Gorgonilla spherules (7)
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  Human brain cell organoid (5)
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  Posterior end of a nematode (5)
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  Stem cell distribution in Hydra vulgaris (5)
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  Flounder larva (4)
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  Deer sperm under fluorescence microscopy (4)
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  Microscopic biomolecule crystals (3)
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  Crystals in Song Dynasty glaze (2)
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  Budding yeast in urine
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  Human neurons
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  Small intestine tissue
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  Birch leaf
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  Mouse neuromuscular junction
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  Cardiac muscle

Non-photographic

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  Bacteriophage T4 infection (9)
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  Turbulence stretching orientation map (7)
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  Solutions to characteristic polynomials (5)
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  Einstein mono-tile demonstration (2)
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  Half rendered scene of simple geometry

Wildlife

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  Whitebark pine forest (6)
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  Crown shyness (5)
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  American painted lady (4)
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  Brown marmorated stink bug (3)
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  Gator reflections (3)
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  Pacific sea nettle (3)
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  Female lion showing teeth (2)
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  Scorpion mom with babies (2)
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  Compass jellyfish (2)
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  Bamboo grove (2)
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  Juvenile falcons awaiting lunch (2)
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  Hummingbird joy (2)
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  Bulking squirrel (2)
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  Old Albert (2)
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  Baby raccoon (2)
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  Baby raccoon
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  Baby raccoon
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  Arctic tern on beach
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  Cat-faced spider
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  Galapagos penguin
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  Sika deer
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  Redwing in flight
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  Black-faced vervet monkey embraces her child
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  Turkey tail mushroom
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  Spider and the moon
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  Cypripedium candidum
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  Burrowing owls
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  Wasp holding spider
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  Mating Galapagos tortoises
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  Polar bear sliding
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  White-tailed deer
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  Sandhill crane
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  Fly on yellow wire
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  Cicada shedding
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  Brown marmorated stink bug
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  Beached whale
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  Cholla cacti
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  Eastern tiger swallowtail
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  Porcelain berry colors
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  Blue iguana
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  Dung mushrooms
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  American bison
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  Paw-paws
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  Regal jumping spider
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  Slime mold
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  Seal swimming among glaciers
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  Blue frog

Image sets

Amino acid birefringence (7)

Threatened flora of Ohio (7)

Nevis linear particle accelerator (6)

Fallout from Chernobyl (4)

String Theory digital collage (3)

Vitamin C birefringence (3)

Mallards in mating frenzy (2)

Humpback whale corpse (2)

Song dynasty glaze

Wildlife of Uganda

Red orb weaver