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Monday, May 12, 2008 |
Monday, May 12, 2008 |
Photo: Pluto Not a Planet, Astronomers RulePluto is no longer a planet, according to a new definition of the term voted on by astronomers, because it does not dominate the neighborhood around its orbit. Charon is half the size of Pluto and orbits along with it; the eight true planets are all far larger than their moons. Image courtesy NASA, ESA and G. Bacon (STScI)
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