Is pluto still a "planet"?

No, pluto used to be considered a planet but now it is considered a dwarf planet.

Explanation:

Pluto was founded in 1930, and was added to be one of the planets.  After Eris was discovered, scientists had to make up a decision.  Whether Eris was going to be the 10th planet in the solar system or not.  Since Eris was similar to Pluto, they started to question whether Pluto was even considered a planet.  Scientists then made up rules that would determine if something was a planet or not.  A new category was created, dwarf planets.  

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