Support WBURGalaxy Quest: Just How Many Earth-Like Planets Are Out There?Play03:26Download AudioNell GreenfieldboyceNovember 05, 2013 ShareThis is an artist's illustration of Kepler-62f, a planet in the "habitable zone" of a star that is slightly smaller and cooler than ours. Kepler-62f is roughly 40 percent larger than Earth. (NASA/JPL-Caltech/T. Pyle)
