NASA'S Kepler Discovers its Smallest 'Habitable Zone' Planets to Date

NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the "habitable zone," the range of distance from a star where the surface temperature of an orbiting planet might be suitable for liquid water.

via NASA Breaking News

http://www.nasa.gov/home/hqnews/2013/apr/HQ_13-112_Kepler_62_finding.html