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Originally Posted by willravel
Pluto isn't a planet. I think we have 9 in our solar system, barring some gravitational oddity.
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I thought that this was a matter of debate. Also, I've read that whether or not an object is a planet is more of a political distinction than a scientific one. Members of the International Astronomical Union designate which astronomical objects qualify as planets and which do not. The line which distinguishes a planet from an asteroid, etc. seems arbitrary.