Astronomers think they have discovered another planet .In 2005 Palomar observatory ,U.S.A, spotted a rocky object in the most distant part of the Solar system. It's official name is 2003 UB313 but it has been nick named as Xena. The planet might be 3000 km in diameter , which is larger than Pluto. It has at least one moon.
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http://www.pkshiu.com/loft/archive/2008/08/scratch-conference-at-mit
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