In this artist's conception released by NASA February 2, 2011, Kepler-11 is a sun-like star around which six planets orbit. At times, two or more planets pass in front of the star at once, as shown in a simultaneous transit of three planets observed by NASA's Kepler spacecraft on August 26, 2010. REUTERS/Tim Pyle/NASA/Handout
An artistic sampling of some far-away worlds.
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