Our Solar System
Saturn's Sisters?
Astronomers scouring the skies for planets beyond our solar system say they have found two planets with masses smaller than Saturn's. The previous 32 so-called extrasolar planets have been as large as, or larger than Jupiter -- the largest planet in our solar system. Astronomers see the discovery of Earth-sized worlds as the Holy Grail in their search for planets outside our solar system.
Credit: Greg Bacon/STScI
   
 
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