'Mega-Earth' Discovery: Kepler-10c Is 17 Times Heavier Than Earth; Astronomers Baffled Over How It Formed

Astronomers have discovered a new type of planet, the "mega-Earth." Kepler-10c is located around 560 light-years from Earth, in the constellation Draco, and is 17 times the mass and double the size of our planet. As for how it was formed, astronomers are stumped as a planet of that size would usually turn into a gas giant (like Jupiter) in the early stages of formation.