popmech:

A team of astrophysicists at the SETI Institute and NASA’s Ames Research Center has just reached a major milestone in the search for life-supporting planets outside our solar system. For the first time, they have discovered an Earth-sized planet nestled in the temperate, liquid-water supporting distance from its star—the so-called habitable zone. "This is a historic discovery," says Geoff Marcy, an astronomer at the University of California, Berkeley who was not involved in the research, "it’s the best case for a habitable planet yet found." 

First Earth-Sized, Potentially Habitable Exoplanet Found