Why are planets and moons round but asteroids aren't?

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KyrosxPhysics
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I am Kyros. Woke up earlier wondering how gravity affects mass and those near it in outer space. mainly to find out and understand why planets and moons are round yet adsteroids arent.
 
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A good opportunity to use one of my favourite pieces of terminology: "oblong spheroid"

Also, welcome!
 

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