In Pictures: NASA - Kepler's most excellent space ...
Relative sizes of Kepler habitable zone planets discovered as of April 2013 in this artist's rendition provided by NASA. (L to R) Kepler-22b, Kepler-69c, Kepler-62e, Kepler 62f and Earth. Scientists using NASA's Kepler space telescope have found the best candidates yet for habitable worlds beyond the solar system.
In Pictures: NASA - Kepler's most excellent space discoveries