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Kepler-22b's radius is roughly 2.4 times the radius of Earth. Its mass and surface composition remain unknown, with only some very rough estimates established: It has less than 124 Earth masses at the 3 sigma confidence limit, and less than 36 Earth masses at 1 sigma confidence. It is thought that the object has a mass similar to that of Neptune (~35 Earth masses). Another possibility is that Kepler-22b is an "ocean-like" world with a mass between 10 and 20 times that of Earth. It might also be comparable to the water-rich planet GJ 1214 b although Kepler-22b, unlike GJ 1214b, is in the habitable zone. If it has an Earth-like composition, the compression of material in the interior of the planet would give an overall mass greater than 40 Earth masses . Such a planet would also produce surface gravity greater than 70 times that on Earth. This is ruled out to at least 1-sigma uncertainty by radial velocity measurements of the system , suggesting Kepler-22b does not have Earth-like composition. It is likely to have a more volatile-rich composition with a liquid or gaseous outer shell; this would make it similar to Kepler-11f, the smallest known gas planet. "If it is mostly ocean with a small rocky core," Natalie Batalha, one of the scientists on the project, speculated "it's not beyond the realm of possibility that life could exist in such an ocean." This possibility of life has spurred SETI to perform research on top candidates for extraterrestrial intelligence. However, if the planet's carbon cycle has ceased due to lack of oceans and plate tectonics, Kepler-22b may turn out to be a searing, sterile super-Venus.[note 2]
Scientists can estimate the possible surface conditions as follows: In the absence of an atmosphere, the equilibrium temperature would be approximately -11°C. If the atmosphere provides a greenhouse effect similar in magnitude to the one on Earth, the planet would have an average surface temperature of 22 °C (72°F). If the atmosphere has a greenhouse effect similar in magnitude to the one on Venus, the planet would have an average surface temperature of 460 °C (860°F).
Originally posted by oghamxx
reply to post by TheGreatest
Define 'intelligent'. More than found on ATS?
The ability to acquire and apply knowledge and skills.
The collection of information of military or political value: "military intelligence".