Why are asteroids and comets such weird shapes?

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While planets and some moons are almost perfectly spherical, the smaller bits of the solar system, such as asteroids and comets, come in all different shapes. But why is that?

Why are asteroids and comets such weird shapes? : Read more

 

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Short version:
Objects have to be a certain size for gravity to pull them into spherical shape during formation.
Below that they can be any shape - as they initially formed or as a result of collision breakage and aggregation.

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