Here the 10 reasons why pluto is not a planet.

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1. Pluto is not large enough to be a planet.
2. Pluto does not have enough mass to be a planet.
3. Pluto does not have an atmosphere.
4. Pluto is not in orbit around the sun.
5. Pluto is not gravitationally bound to the sun.
6. Pluto is not round.
7. Pluto does not have a rocky surface.
8. Pluto does not have any moons.
9. Pluto is not visible to the naked eye.
10. There is significant debate amongst astronomers as to whether or not Pluto should be classified as a planet.