The planet, about two and a half times the size of Earth, is in a category of planets called super-Earths that do not exist in our solar system.
By DENNIS OVERBYE, New York Times
Thu, 12/18/2014 - 4:01pm
The planet, about two and a half times the size of Earth, is in a category of planets called super-Earths that do not exist in our solar system.