Kepler 10c
Kepler-10c orbits a star about 560 light-years away in the constellation Draco
diameter 29,000km, or 2.3 times the width of Earth and has a mass some 17 times that of Earth.
Considered a "mega-Earth" Kepler-10c may have a thin atmosphere
Theorists thought that any planet this large would pull so much hydrogen on to itself that it would look more like a Neptune or a Jupiter.
Earth, Surface area 510,072,000 km² (Surface Area of a Sphere is equal to 4πr^2)