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It needs to be in orbit around the Sun
– Yes, so maybe Pluto is a planet.

It needs to have enough gravity to pull itself into a spherical shape
– Pluto…check

It needs to have "cleared the neighborhood" of its orbit
– Uh oh. Here's the rule breaker. According to this, Pluto is not a planet.

For more information see:
http://www.universetoday.com/2008/04/10/why-pluto-is-no-longer-a-planet/

 

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