NASA scientists announce discovery of two Earth-sized planets
Posted December 20, 2011 6:16 pm.
This article is more than 5 years old.
Scientists at NASA have announced the discovery of two Earth-sized planets orbiting a star 950 light-years away.
Kepler 20E and 20F are far too close to their sun to be habitable, with temperatures near 760 degrees Celsius, however scientists say one of them may have had liquid water at one time.
Astronomers say the two planets are the smallest, most earth-size alien worlds known.
