NASA scientists today announced the discovery of two Earth sized planets, named Kepler 20E and 20F. The planets were discovered by the Kepler space telescope team. "The first of the two planets has a diameter just 3 percent larger than the Earth, which makes it the closest object to Earth, in terms of size in the known universe," said Francois Fressin, Harvard-Smithsonian Center for Astrophysics, during a conference call to announce the major discovery.
The two planets are believed to be too close to their sun and thus too hot to be habitable with temperatures ranging from 800 to 14
hundred degrees. Scientists speculate that Kepler 20F might have had liquid water at one time in its history and could have been habitable.
The Kepler science team says this is the first time humanity has been able to detect planets of Earth size in the Universe.