When did Pluto officially become a planet?
by 
keithold thanks all baggers
ANSWERS: 4
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Pluto was discovered in 1930, and has two moons!
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Well, it became a planet at around the same time as earth did, but i'm not sure when it was recorded as one...
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'Pluto was discovered in 1930 by a fortunate accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune, based on the motions of Uranus and Neptune. Not knowing of the error, Clyde W. Tombaugh at Lowell Observatory in Arizona did a very careful sky survey which turned up Pluto anyway. After the discovery of Pluto, it was quickly determined that Pluto was too small to account for the discrepancies in the orbits of the other planets. The search for Planet X continued but nothing was found. Nor is it likely that it ever will be: the discrepancies vanish if the mass of Neptune determined from the Voyager 2 encounter with Neptune is used. There is no Planet X. But that doesn't mean there aren't other objects out there, only that there isn't a relatively large and close one like Planet X was assumed to be. In fact, we now know that there are a very large number of small objects in the Kuiper Belt beyond the orbit of Neptune, some roughly the same size as Pluto.' Information: http://www.nineplanets.org/pluto.html
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Plutos life as an official planet lasted from 1930 to 2006, it is now considered a plutoid, link http://en.wikipedia.org/wiki/Pluto
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