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The Gliese 581 system is estimated to be from 7 to 11 billion years old. [1] By comparison, our Solar System is estimated to be 4.6 billion years old. [2]
- ^ Selsis 3.4
- ^ Gary Ernst Wallace (2000). "Earth's Place in the Solar System". Earth Systems: Processes and Issues. Cambridge University Press. pp. 45–58. ISBN 0521478952.
I removed the above Age section because, after finding obspm.fr a deadlink, then finding http://exoplanet.eu/star.php?st=Gl+581 claimed 4.3 Gyr but linked to article on HD 4308, and then finding Selsis estimated 7 to 11 while W. von Bloh writes of an age at "least 2 Gyr" I suspected the age is somewhat unknown at present. I put the 7 to 11 estimate in the parent star article Gliese 581, though.
I also made these edits:
- 84user ( talk) 20:19, 27 September 2008 (UTC)
I see that the infobox uses exoplanet.eu for four properties. Should we cite papers directly in addition to collators such as SIMBAD and exoplanet? I followed exoplanet's ref to Udry's letter and verified our figures match Udry's table 1 for the eccentric case. However our Time of perihelion was taken from the circular case, a trivial difference. I may as well check the other exoplanet cites now. I also fixed my incorrect diff link above. 84user ( talk) 22:06, 4 October 2008 (UTC)
I edited the Talk:Gliese 581 c/GA1 sub-article transcluded above, but the changes do not appear on this talk page until I actually edit this talk page (which is the reason for this edit\). - 84user ( talk) 21:18, 27 September 2008 (UTC)
I noticed that User:142.161.15.88 has added the following to the article: [1] - however I suspect that this is invalid: it doesn't really make physical sense to transfer the addition of temperatures in this way - the underlying principles are albedo, emissivity and various feedback loops, which makes this very dodgy. Personally I think this should be removed, but I've left tags on them for the moment. Icalanise ( talk) 09:27, 18 September 2008 (UTC)
Greenhouse warming | ||||
Atmosphere | (A, ε) | Earth orbit | Venus orbit | Gliese 581 c orbit |
T∗=5780 K, R∗=1 R⊙ d=1 AU |
T∗=5780 K, R∗=1 R⊙ d=0.723 AU |
T∗=3480 K, R∗=0.29 R⊙ d=0.073 AU | ||
Earthlike | (0.3, 0.614) | 32 K | 37.5 K | 38.4 K |
Venuslike | (0.65, 0.0181) | 380 K | 435 K | 444 K |
The following statement was inserted into the article by User:GabrielVelasquez and reinserted by User:198.163.53.10, who on the basis of [2] is the same as User:GabrielVelasquez (I'm going to give him the benefit of the doubt and assume he merely forgot to log in, rather than tried to use the IP address of a public library to try and give the illusion of more support for his viewpoint)
All temperature speculations are based on the the temperature (heat from) of the parent star, Gliese 581, and have been calculated in error as no the scientist so far that has touched on the subject has factored in the wide margin of error for the star's temperature of 3432°K to 3528 °K.
I think this is strongly POV (note for example that taking the middle of the range 3480 K, this corresponds to an error of about 1.4%) and does not belong in the article. Icalanise ( talk) 22:05, 1 October 2008 (UTC)
(2) Second error is worse:
Equilibrium temperature for a planet is the temperature without the atmosphere. The examples that are used when scientist use this kind of comparison is done without the greenhouse gas effect, the planet's results are compared to Earth's Equilibrium temperature, of which all the formulas I have seen all of them put it at about -18°C. I can quote a least one scientist who has published that the atmosphere of Venus is toxic and not habitable. So to calculate the equilibrium temperatuer for Gliese 581 c then use the albedo of a planet like Venus, when the albedo is based on the atmosphere is a contradiction of perposterous perportions. The 0.64 albedo is from Venus' atmosphere, so using a formula that pointedly ignores the atmosphere and adding the albedo of the atmosphere (without factoring in the emissivity) is deceptive and that kind of contradiction should not be allowed the article. If you are trying to get the surface temperature then it would be the emissivity not albedo of the Earth that the comparison should be based on. Selsis et al should be ashamed of themselves for publishing this misleading hype, and it should be removed from the article as cleanly cut as possible. GabrielVelasquez ( talk) 20:28, 4 October 2008 (UTC)
It is important to discuss the meaning of Teq and the manner in which it can be used to assess habitability. The planet Gl 581c has been widely presented as potentially habitable because one finds Teq ∼ 320 K when calculated using the albedo of the Earth. This conclusion is however too simplistic for the following two reasons:
i) For a planet with a dense atmosphere (an inherent property of a habitable planet), Teq does not indicate any physical temperatures at the surface or in the atmosphere. With albedos of 0.75, 0.29, and 0.22, respectively, and assuming f = 4, Venus, Earth, and Mars have equilibrium temperatures of 231 K, 255 K, and 213 K, while their mean surface temperatures are 737 K, 288 K and 218 K. The two quantities only match, approximately, in the case of Mars, whose tenuous atmosphere produces a greenhouse warming of only ∼5 K.
ii) It can be demonstrated that a necessary (but not sufficient) condition for habitability is that Teq must be lower than about 270 K. If the surface temperature remains below the critical temperature of water (Tc = 647 K), the thermal emission of a habitable planet cannot exceed the runaway greenhouse threshold, ∼300 W m−2 (see Sect. 2.2.1), equivalent to the irradiance of a black-body at 270 K. Therefore, if a planet has an atmosphere and an equilibrium temperature above 270 K, two situations may arise. First, Ts may remain below Tc, but there would be no liquid water at the surface and no or negligible amounts of water vapor in the atmosphere. In a second possible situation, the atmosphere contains considerable amounts of water vapor, but the surface temperature exceeds 1400 K (see Sect. 2.2.1). This would allow the planet to balance the absorbed stellar energy by radiating at visible and radio wavelengths through an atmosphere that is optically thick in the infrared (IR). Both cases would render the planet uninhabitable.
Celestia, first of all is not a valid reference, it is rife with errors.
Secondly, the "argument of perihelion" for each these planets is unknown,
so the depiction is no better than science fiction.
GabrielVelasquez (
talk)
21:09, 4 October 2008 (UTC)
# Catalog of 293 known extrasolar planets. # # Data compiled from Butler et al., Catalog of Nearby Exoplanets at: # http://arxiv.org/abs/astro-ph/0607493 # supplemented from the Extrasolar Planets Encyclopaedia at: # http://exoplanet.eu/catalog.php # The mu Ara system is taken from Pepe et al., The HARPS Search for Southern Extra-solar Planets at: # http://arxiv.org/abs/astro-ph/0608396
Since this image should really be an SVG, I've created a new version of the diagram, with the data derived directly from the Udry et al. discovery paper (this is referenced on the image description page and in the comments inside the SVG file itself - open the original file in a text editor to have a look). Hope it is ok. Icalanise ( talk) 13:48, 5 October 2008 (UTC)
GabrielVelasquez, why not file an RfC on this matter if it troubles you so much. Orbit diagrams produced in much the same way have been accepted on other articles about exoplanetary systems for a long time on the Wikipedia, so the matter of whether such depictions should be accepted should be discussed in a more general forum than this article's talk page. Icalanise ( talk) 20:35, 5 October 2008 (UTC)
GabrielVelasquez ( talk) 20:57, 5 October 2008 (UTC)
This is not OR. Plugging known data into established formulas is not OR, despite the comment by GabrielVelasquez above. It never has been. People output such graphics all the time on Wikipedia. The broad, established consensus is that this is ok and not OR. Whether it's relevant or interesting is another issue. -- C S ( talk) 09:58, 6 October 2008 (UTC)
Note that there is a specific exception in the NOR policy for images: "A notable exception to this policy concerns images: Wikipedia editors are encouraged to take photographs or draw pictures or diagrams and upload them,..." ( WP:OI). Of course, ff there are disagreements about the accuracy of a diagram, they have to be resolved by discussion; there's no free pass to put in bad diagrams. But "original research" is not forbidden in diagrams the same way it is in text; if there is agreement to use a particular original image, then the policy permits it. — Carl ( CBM · talk) 13:49, 6 October 2008 (UTC)
I'm looking at the above support for the orbit diagram and the discription fits the chart as well. I think the chart of Albedo/Emissivity temperature is less speculative that the assumption of the plane of the orbits. I'm not saying that one is worth more than the other they are different sets of data, although someone mistook them for the same, all I am saying is if there is no prohibition against in then why not use it, the known formula being from NASA and the know data being from Gliese 581 c, and call the range of possibilites known Albedo and Emissivity. GabrielVelasquez ( talk) 00:58, 16 October 2008 (UTC)
about 581c/d: "The inner planet is probably too hot for liquid water to exist on its surface and the outer one a bit too cold, although their temperatures would would depend on the nature of any atmosphere."
Hehe.... there's a nice reference for the "temperature debate". :)-- Marhawkman ( talk) 08:30, 28 October 2008 (UTC)
This "object" is not on the list of confirmed extrasolar planets, and this important fact should not be left out of the article, any "planet" article for that matter. There is confirmed and there is unconfirmed (candidate), and there shouldn't be any debate on this fact, so anyone messing with this edit should be considered to be vandalizing. 198.163.53.10 ( talk) 18:26, 19 December 2008 (UTC)
Is this really a reasonable statement to have in the lede? The dynamically-determined upper limit on the mass means this planet could potentially be in the Neptune-mass regime. Furthermore there is no knowledge of whether this planet is terrestrial, an icy (ocean) planet, a small ice giant (Neptune-analogue), or something else. Icalanise ( talk) 10:15, 29 October 2008 (UTC)
I initially removed all of the references to "(extremophile forms of)" for two main reasons. The first is that is was unnecessary repetition of the same thing. And the second reason is that it was inserted in a very ugly fashion. I am not suggesting that there should be no mention of it at all. Maybe it could be inserted in a better way that is not repetitive and a way that is more descriptive. Perhaps one or two sentences in the appropriate place would do the job? HumphreyW ( talk) 00:40, 20 December 2008 (UTC)
I feel the same way about the repeated parenthetical qualification; it is redundant and ugly. I do agree that it is very important to thoroughly explain what "habitability" means in this context - mainly the possibility for water to be in the liquid state, if it happens to be present. Obviously it takes more than just liquid water for life to arise or even just survive, and far more is required for human life to be sustainable (without major life support systems). But this explanation and qualification of "habitable" should only be included once - repeating it over and over is just clutter. Sakkura ( talk) 16:24, 13 March 2009 (UTC)
The discussion is moot as the section has been removed but the qualification will remain if the a brand new section (with current citations of scientists not journalists) is rewritten because there is no reason to confuse layman readers with the idea that the planet is habitable for people as has been hyped by some journalists, a sensationalism that likely started here with the quotes from the speculative discovery team of astronomer's (not astrobiologist's) hopes. GabrielVelasquez ( talk) 07:43, 4 September 2009 (UTC)
I cannot find any source for this claim in section 5. Possible Contact.
"At approximately 20:45 UTC on 17 March 2009 faint radio signals were detected by SETI, coming from the direction of the Gliese 581 system. Although no language as we know it is present, the transmission features complex patterns of noise."
98.247.91.216 ( talk) 23:10, 18 March 2009 (UTC)
http://thedianerehmshow.org/audio-player?nid=13421 at 24 minutes they let callers in, the first person claims to be a scientist who made contact... — Preceding
unsigned comment added by
129.33.49.251 (
talk)
15:09, 9 August 2011 (UTC)
Isn't the newly discovered 'Gliese 581 e' placing the whole planetary system more to scale?
I think the image of the habitable zone is as of today outdated. What about it? 83.136.195.130 ( talk) 13:02, 23 April 2009 (UTC)
The discovery site of this astronomical body was not Switzerland but the IV Region of Chile. The team who worked on the project included scientists from Switzerland but also from France and other countries.
Unless La Silla in the Atacama desert is an extraterritorial claim of ESO or of Switzerland? Moshe-paz ( talk) 12:17, 2 July 2009 (UTC)
I'm gong to break this up for readability. Viriditas ( talk) 22:24, 20 October 2009 (UTC)
I saw on here that it says the planet may lie outside the habitable zone, yet in this National Geography article it says it lies inside the Habitable zone and it has liquid water. http://news.nationalgeographic.com/news/2009/04/090421-most-earthlike-planet.html
i didnt look much into it, just thought i might share and see if you guys think we should change it. I dont know how to change it myself so if needed someone else should —Preceding unsigned comment added by 74.128.104.138 ( talk) 18:53, 21 June 2010 (UTC)
The artist's conception image should be removed or at least taken out of the planet's infobox and placed as "decoration" in the text of the article. There's nothing encyclopedic (and a lot that's misleading or just fanciful) about this (and most "impression") images. — Aldaron • T/ C 23:04, 6 October 2010 (UTC)
The article claims that COROT-7b is the smallest confirmed extrasolar planet. The article at COROT-7b says it was the smallest until the discovery of Kepler-10b (1.4 Earth radii) in 2011, but there is no mention of being the smallest in Kepler's article. Furthermore, other discovered planets like PSR B1257+12 A (discovered in 2005) are claimed to be of sizes much smaller than Earth--one-fifth the size of Pluto as claimed in this reference. Now more recently in a January 2012 article here it is claimed that the three smallest extra solar planets ever found (the smallest of which was roughly Mars-sized), had just been discovered. Can anyone shed light on these discrepancies? Possibly something to do with the definition of what a planet is? Zujua ( talk) 01:28, 21 July 2012 (UTC)
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The Gliese 581 system is estimated to be from 7 to 11 billion years old. [1] By comparison, our Solar System is estimated to be 4.6 billion years old. [2]
- ^ Selsis 3.4
- ^ Gary Ernst Wallace (2000). "Earth's Place in the Solar System". Earth Systems: Processes and Issues. Cambridge University Press. pp. 45–58. ISBN 0521478952.
I removed the above Age section because, after finding obspm.fr a deadlink, then finding http://exoplanet.eu/star.php?st=Gl+581 claimed 4.3 Gyr but linked to article on HD 4308, and then finding Selsis estimated 7 to 11 while W. von Bloh writes of an age at "least 2 Gyr" I suspected the age is somewhat unknown at present. I put the 7 to 11 estimate in the parent star article Gliese 581, though.
I also made these edits:
- 84user ( talk) 20:19, 27 September 2008 (UTC)
I see that the infobox uses exoplanet.eu for four properties. Should we cite papers directly in addition to collators such as SIMBAD and exoplanet? I followed exoplanet's ref to Udry's letter and verified our figures match Udry's table 1 for the eccentric case. However our Time of perihelion was taken from the circular case, a trivial difference. I may as well check the other exoplanet cites now. I also fixed my incorrect diff link above. 84user ( talk) 22:06, 4 October 2008 (UTC)
I edited the Talk:Gliese 581 c/GA1 sub-article transcluded above, but the changes do not appear on this talk page until I actually edit this talk page (which is the reason for this edit\). - 84user ( talk) 21:18, 27 September 2008 (UTC)
I noticed that User:142.161.15.88 has added the following to the article: [1] - however I suspect that this is invalid: it doesn't really make physical sense to transfer the addition of temperatures in this way - the underlying principles are albedo, emissivity and various feedback loops, which makes this very dodgy. Personally I think this should be removed, but I've left tags on them for the moment. Icalanise ( talk) 09:27, 18 September 2008 (UTC)
Greenhouse warming | ||||
Atmosphere | (A, ε) | Earth orbit | Venus orbit | Gliese 581 c orbit |
T∗=5780 K, R∗=1 R⊙ d=1 AU |
T∗=5780 K, R∗=1 R⊙ d=0.723 AU |
T∗=3480 K, R∗=0.29 R⊙ d=0.073 AU | ||
Earthlike | (0.3, 0.614) | 32 K | 37.5 K | 38.4 K |
Venuslike | (0.65, 0.0181) | 380 K | 435 K | 444 K |
The following statement was inserted into the article by User:GabrielVelasquez and reinserted by User:198.163.53.10, who on the basis of [2] is the same as User:GabrielVelasquez (I'm going to give him the benefit of the doubt and assume he merely forgot to log in, rather than tried to use the IP address of a public library to try and give the illusion of more support for his viewpoint)
All temperature speculations are based on the the temperature (heat from) of the parent star, Gliese 581, and have been calculated in error as no the scientist so far that has touched on the subject has factored in the wide margin of error for the star's temperature of 3432°K to 3528 °K.
I think this is strongly POV (note for example that taking the middle of the range 3480 K, this corresponds to an error of about 1.4%) and does not belong in the article. Icalanise ( talk) 22:05, 1 October 2008 (UTC)
(2) Second error is worse:
Equilibrium temperature for a planet is the temperature without the atmosphere. The examples that are used when scientist use this kind of comparison is done without the greenhouse gas effect, the planet's results are compared to Earth's Equilibrium temperature, of which all the formulas I have seen all of them put it at about -18°C. I can quote a least one scientist who has published that the atmosphere of Venus is toxic and not habitable. So to calculate the equilibrium temperatuer for Gliese 581 c then use the albedo of a planet like Venus, when the albedo is based on the atmosphere is a contradiction of perposterous perportions. The 0.64 albedo is from Venus' atmosphere, so using a formula that pointedly ignores the atmosphere and adding the albedo of the atmosphere (without factoring in the emissivity) is deceptive and that kind of contradiction should not be allowed the article. If you are trying to get the surface temperature then it would be the emissivity not albedo of the Earth that the comparison should be based on. Selsis et al should be ashamed of themselves for publishing this misleading hype, and it should be removed from the article as cleanly cut as possible. GabrielVelasquez ( talk) 20:28, 4 October 2008 (UTC)
It is important to discuss the meaning of Teq and the manner in which it can be used to assess habitability. The planet Gl 581c has been widely presented as potentially habitable because one finds Teq ∼ 320 K when calculated using the albedo of the Earth. This conclusion is however too simplistic for the following two reasons:
i) For a planet with a dense atmosphere (an inherent property of a habitable planet), Teq does not indicate any physical temperatures at the surface or in the atmosphere. With albedos of 0.75, 0.29, and 0.22, respectively, and assuming f = 4, Venus, Earth, and Mars have equilibrium temperatures of 231 K, 255 K, and 213 K, while their mean surface temperatures are 737 K, 288 K and 218 K. The two quantities only match, approximately, in the case of Mars, whose tenuous atmosphere produces a greenhouse warming of only ∼5 K.
ii) It can be demonstrated that a necessary (but not sufficient) condition for habitability is that Teq must be lower than about 270 K. If the surface temperature remains below the critical temperature of water (Tc = 647 K), the thermal emission of a habitable planet cannot exceed the runaway greenhouse threshold, ∼300 W m−2 (see Sect. 2.2.1), equivalent to the irradiance of a black-body at 270 K. Therefore, if a planet has an atmosphere and an equilibrium temperature above 270 K, two situations may arise. First, Ts may remain below Tc, but there would be no liquid water at the surface and no or negligible amounts of water vapor in the atmosphere. In a second possible situation, the atmosphere contains considerable amounts of water vapor, but the surface temperature exceeds 1400 K (see Sect. 2.2.1). This would allow the planet to balance the absorbed stellar energy by radiating at visible and radio wavelengths through an atmosphere that is optically thick in the infrared (IR). Both cases would render the planet uninhabitable.
Celestia, first of all is not a valid reference, it is rife with errors.
Secondly, the "argument of perihelion" for each these planets is unknown,
so the depiction is no better than science fiction.
GabrielVelasquez (
talk)
21:09, 4 October 2008 (UTC)
# Catalog of 293 known extrasolar planets. # # Data compiled from Butler et al., Catalog of Nearby Exoplanets at: # http://arxiv.org/abs/astro-ph/0607493 # supplemented from the Extrasolar Planets Encyclopaedia at: # http://exoplanet.eu/catalog.php # The mu Ara system is taken from Pepe et al., The HARPS Search for Southern Extra-solar Planets at: # http://arxiv.org/abs/astro-ph/0608396
Since this image should really be an SVG, I've created a new version of the diagram, with the data derived directly from the Udry et al. discovery paper (this is referenced on the image description page and in the comments inside the SVG file itself - open the original file in a text editor to have a look). Hope it is ok. Icalanise ( talk) 13:48, 5 October 2008 (UTC)
GabrielVelasquez, why not file an RfC on this matter if it troubles you so much. Orbit diagrams produced in much the same way have been accepted on other articles about exoplanetary systems for a long time on the Wikipedia, so the matter of whether such depictions should be accepted should be discussed in a more general forum than this article's talk page. Icalanise ( talk) 20:35, 5 October 2008 (UTC)
GabrielVelasquez ( talk) 20:57, 5 October 2008 (UTC)
This is not OR. Plugging known data into established formulas is not OR, despite the comment by GabrielVelasquez above. It never has been. People output such graphics all the time on Wikipedia. The broad, established consensus is that this is ok and not OR. Whether it's relevant or interesting is another issue. -- C S ( talk) 09:58, 6 October 2008 (UTC)
Note that there is a specific exception in the NOR policy for images: "A notable exception to this policy concerns images: Wikipedia editors are encouraged to take photographs or draw pictures or diagrams and upload them,..." ( WP:OI). Of course, ff there are disagreements about the accuracy of a diagram, they have to be resolved by discussion; there's no free pass to put in bad diagrams. But "original research" is not forbidden in diagrams the same way it is in text; if there is agreement to use a particular original image, then the policy permits it. — Carl ( CBM · talk) 13:49, 6 October 2008 (UTC)
I'm looking at the above support for the orbit diagram and the discription fits the chart as well. I think the chart of Albedo/Emissivity temperature is less speculative that the assumption of the plane of the orbits. I'm not saying that one is worth more than the other they are different sets of data, although someone mistook them for the same, all I am saying is if there is no prohibition against in then why not use it, the known formula being from NASA and the know data being from Gliese 581 c, and call the range of possibilites known Albedo and Emissivity. GabrielVelasquez ( talk) 00:58, 16 October 2008 (UTC)
about 581c/d: "The inner planet is probably too hot for liquid water to exist on its surface and the outer one a bit too cold, although their temperatures would would depend on the nature of any atmosphere."
Hehe.... there's a nice reference for the "temperature debate". :)-- Marhawkman ( talk) 08:30, 28 October 2008 (UTC)
This "object" is not on the list of confirmed extrasolar planets, and this important fact should not be left out of the article, any "planet" article for that matter. There is confirmed and there is unconfirmed (candidate), and there shouldn't be any debate on this fact, so anyone messing with this edit should be considered to be vandalizing. 198.163.53.10 ( talk) 18:26, 19 December 2008 (UTC)
Is this really a reasonable statement to have in the lede? The dynamically-determined upper limit on the mass means this planet could potentially be in the Neptune-mass regime. Furthermore there is no knowledge of whether this planet is terrestrial, an icy (ocean) planet, a small ice giant (Neptune-analogue), or something else. Icalanise ( talk) 10:15, 29 October 2008 (UTC)
I initially removed all of the references to "(extremophile forms of)" for two main reasons. The first is that is was unnecessary repetition of the same thing. And the second reason is that it was inserted in a very ugly fashion. I am not suggesting that there should be no mention of it at all. Maybe it could be inserted in a better way that is not repetitive and a way that is more descriptive. Perhaps one or two sentences in the appropriate place would do the job? HumphreyW ( talk) 00:40, 20 December 2008 (UTC)
I feel the same way about the repeated parenthetical qualification; it is redundant and ugly. I do agree that it is very important to thoroughly explain what "habitability" means in this context - mainly the possibility for water to be in the liquid state, if it happens to be present. Obviously it takes more than just liquid water for life to arise or even just survive, and far more is required for human life to be sustainable (without major life support systems). But this explanation and qualification of "habitable" should only be included once - repeating it over and over is just clutter. Sakkura ( talk) 16:24, 13 March 2009 (UTC)
The discussion is moot as the section has been removed but the qualification will remain if the a brand new section (with current citations of scientists not journalists) is rewritten because there is no reason to confuse layman readers with the idea that the planet is habitable for people as has been hyped by some journalists, a sensationalism that likely started here with the quotes from the speculative discovery team of astronomer's (not astrobiologist's) hopes. GabrielVelasquez ( talk) 07:43, 4 September 2009 (UTC)
I cannot find any source for this claim in section 5. Possible Contact.
"At approximately 20:45 UTC on 17 March 2009 faint radio signals were detected by SETI, coming from the direction of the Gliese 581 system. Although no language as we know it is present, the transmission features complex patterns of noise."
98.247.91.216 ( talk) 23:10, 18 March 2009 (UTC)
http://thedianerehmshow.org/audio-player?nid=13421 at 24 minutes they let callers in, the first person claims to be a scientist who made contact... — Preceding
unsigned comment added by
129.33.49.251 (
talk)
15:09, 9 August 2011 (UTC)
Isn't the newly discovered 'Gliese 581 e' placing the whole planetary system more to scale?
I think the image of the habitable zone is as of today outdated. What about it? 83.136.195.130 ( talk) 13:02, 23 April 2009 (UTC)
The discovery site of this astronomical body was not Switzerland but the IV Region of Chile. The team who worked on the project included scientists from Switzerland but also from France and other countries.
Unless La Silla in the Atacama desert is an extraterritorial claim of ESO or of Switzerland? Moshe-paz ( talk) 12:17, 2 July 2009 (UTC)
I'm gong to break this up for readability. Viriditas ( talk) 22:24, 20 October 2009 (UTC)
I saw on here that it says the planet may lie outside the habitable zone, yet in this National Geography article it says it lies inside the Habitable zone and it has liquid water. http://news.nationalgeographic.com/news/2009/04/090421-most-earthlike-planet.html
i didnt look much into it, just thought i might share and see if you guys think we should change it. I dont know how to change it myself so if needed someone else should —Preceding unsigned comment added by 74.128.104.138 ( talk) 18:53, 21 June 2010 (UTC)
The artist's conception image should be removed or at least taken out of the planet's infobox and placed as "decoration" in the text of the article. There's nothing encyclopedic (and a lot that's misleading or just fanciful) about this (and most "impression") images. — Aldaron • T/ C 23:04, 6 October 2010 (UTC)
The article claims that COROT-7b is the smallest confirmed extrasolar planet. The article at COROT-7b says it was the smallest until the discovery of Kepler-10b (1.4 Earth radii) in 2011, but there is no mention of being the smallest in Kepler's article. Furthermore, other discovered planets like PSR B1257+12 A (discovered in 2005) are claimed to be of sizes much smaller than Earth--one-fifth the size of Pluto as claimed in this reference. Now more recently in a January 2012 article here it is claimed that the three smallest extra solar planets ever found (the smallest of which was roughly Mars-sized), had just been discovered. Can anyone shed light on these discrepancies? Possibly something to do with the definition of what a planet is? Zujua ( talk) 01:28, 21 July 2012 (UTC)
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