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To be considered a planet, an object must be massive enough to be rounded into a spheroid by its own mass but not massive enough to cause thermonuclear fusion.

Additionally, a planet must be orbiting a star or what used to be a star, and it must not be part of a disk of similar objects, like a Kuiper belt object.

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11y ago
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9y ago

the size of Mercury , not Pluto. Scientists say "Its just a big Asteroid."

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12y ago

It cannot be too small, and must have something that's natural, if it's just a big hunk of junk laying there like Pluto... ITS NOT A PLANET.

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Q: How big does a planet have to be to be a planet?
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