Wednesday, December 21, 2005

Rethinking the planets

'The most exclusive club in the solar system will be revising its membership rules this year. In all of history, only nine orbs in the sun's entourage have earned the title "planet." But that changed last summer, when an object significantly bigger than Pluto was spotted lurking in a little-explored region of the solar system known as the Kuiper Belt. Nicknamed Xena, the object—officially known as 2003 UB313—was soon being called the 10th planet by headline writers and even some astronomers.' More


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