<P> Kepler - 10b, Kepler - 20b, Kepler - 36b, Kepler - 48d, Kepler 68c, Kepler - 78b, Kepler - 89b, Kepler - 93b, Kepler - 97b, Kepler - 99b, Kepler - 100b, Kepler - 101c, Kepler - 102b, Kepler - 102d, Kepler - 113b, Kepler - 131b, Kepler - 131c, Kepler - 138c, Kepler - 406b, Kepler - 406c, Kepler - 409b . </P> <P> The Neptune - mass planet Kepler - 10c also has a density> 5 g / cm and is thus very likely terrestrial . </P> <P> In 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth - and super-Earth - sized planets orbiting in the habitable zones of Sun - like stars and red dwarfs within the Milky Way . 11 billion of these estimated planets may be orbiting Sun - like stars . The nearest such planet may be 12 light - years away, according to the scientists . However, this does not give estimates for the number of extrasolar terrestrial planets, because there are planets as small as Earth that have been shown to be gas planets (see KOI - 314c). </P> <P> Several possible classifications for terrestrial planets have been proposed: </P>

This is the group of rocky planets in the solar system closest to the sun