Smallest planet yet found outside solar system

This artist's conception provided by the Harvard-Smithsonian Center for Astrophysics shows a hypothetical planet with two moons orbiting in the habitable zone of a red dwarf star. Earth-like worlds may be closer and more plentiful than anyone imagined. Astronomers reported Wednesday, Feb. 6, 2013 that the closest Earth-like planet may be just 13 light years away. That planet hasn't been found yet, but should be there based on the team's study of red dwarf stars which are the most common stars in our galaxy. (AP Photo/Harvard-Smithsonian Center for Astrophysics, David A. Aguilar) Photo by
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