<P> Kepler - 22b 's size is roughly twice that of Earth . Its mass and surface composition are unknown . An Earth - like composition for the planet has been ruled out . It is likely to have a volatile - rich composition with a liquid or gaseous outer shell . The only parameters of the planet 's orbit that are currently available are its orbital period , which is about 290 days , and its inclination , which is approximately 90 ° . Evidence suggests that the planet has a moderate surface temperature , assuming that the surface is not subject to extreme greenhouse heating . In the absence of an atmosphere , its equilibrium temperature ( assuming an Earth - like albedo ) would be approximately 262 K ( − 11 ° C ) , compared to Earth 's 255 K ( − 18 ° C ) </P>
<P> Kepler - 22b 's size is roughly twice that of Earth . Its mass and surface composition are unknown . An Earth - like composition for the planet has been ruled out . It is likely to have a volatile - rich composition with a liquid or gaseous outer shell . The only parameters of the planet 's orbit that are currently available are its orbital period , which is about 290 days , and its inclination , which is approximately 90 ° . Evidence suggests that the planet has a moderate surface temperature , assuming that the surface is not subject to extreme greenhouse heating . In the absence of an atmosphere , its equilibrium temperature ( assuming an Earth - like albedo ) would be approximately 262 K ( − 11 ° C ) , compared to Earth 's 255 K ( − 18 ° C ) </P>
what is the surface of kepler 22b like
what is the surface of kepler 22b like
unknown
unknown