A team of astronomers led by Xavier Dumusque of the Harvard-Smithsonian CFA (Center for Astrophysics) has discovered a planet different from those found so far that has been called mega- Earth. It is a rocky planet that is much larger than astronomers had expected from a planet of this type. The planet Kepler- 10c has a size that is approximately 2.3 times that of Earth , but above all has a mass about 17 times greater.