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Pluto is a dwarf planet, as astronomers have found millions of Pluto like objects circling the sun in the kuiper belt, some are even bigger than Pluto like Eris. So they decided to call all these plutoids dwarf planets, instead of adding lots more planets to the solar system.

A dwarf planet has to be big enough to plough its way out of other objects like asteroids and its gravity has to be strong enough to hold it in a spherical shape.

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13y ago

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