Astronomers struggle to define 'planet'

(AP) -- Our solar system is suffering an identity crisis. For decades, it has consisted of nine planets, even as scientists debated whether Pluto really belonged. Then the recent discovery of an object larger and farther away than Pluto threatened to throw this slice of the cosmos into chaos.

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<p><a href="http://www.physorg.com/news74703928.html">Astronomers struggle to define 'planet'</a></p> <p>(AP) -- Our solar system is suffering an identity crisis. For decades, it has consisted of nine planets, even as scientists debated whether Pluto really belonged. Then the recent discovery of an object larger and farther away than Pluto threatened to throw this slice of the cosmos into chaos.</p>