In 2007 Pluto was classified as an object on the Kupier Belt, which meant that it was no longer a planet. To be a planet you need to orbit around the Sun, which Pluto does. It also has to have enough gravitational pull to be able to control any other objects in the orbit. Pluto also does that. To also be a planet you need to have a clear neighborhood. That is were Pluto is disqualified. Pluto doesn't have a clear neighborhood it is 0.07 times the mass of other objects in the orbit. Pluto may be considered the ninth planet after Neptune, but there is still something on the Kupier Belt that is larger then Pluto such as Eris.
However Pluto may not be a planet but my body isn't a planet either. Alpha Centauri is a star. It is the star that is closer to Earth. Alpha Centauri is not a planet because it does not orbit around a star because it is a star. It also isn't a planet because it doesn't have enough gravitational pull to be able to control any other objects in its orbit. It also isn't a planet because it is not spherical.
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