Habitable Earth-Size Planets Common Across the Universe, Study Suggests

Planets similar to Earth may not be that rare in the galaxy, new research suggests. About one in five sunlike stars observed by NASA's Kepler spacecraft has an Earth-size planet in the so-called habitable zone, where liquid water might exist.



via LiveScience.com http://www.livescience.com/40934-habitable-earthlike-alien-planets-common-kepler.html