Rubble pile
Celestial body composed of many pieces of rock held together by gravity / From Wikipedia, the free encyclopedia
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In astronomy, a rubble pile is a celestial body that consists of numerous pieces of debris that have coalesced under the influence of gravity. Rubble piles have low density because there are large cavities between the various chunks that make them up.
The asteroids Bennu and Ryugu have a measured bulk density which suggests that their internal structure is a rubble pile.[1][2] Many comets and most smaller minor planets (<10 km in diameter) are thought to be composed of coalesced rubble.[3][4]