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Rubble pile
In astronomy, a rubble pile is an object that is not a monolith, consisting instead of numerous pieces of rock 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. Many asteroids and comets are thought to be composed of coalesced rubble. ==Overview==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Rubble pile」の詳細全文を読む
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