it's called magic
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Aka, sufficiently advanced technology.
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Just spitballing, but if two sufficiently large objects collide, that's still a lot of kinetic energy. I suspect our intuitions about small objects colliding will mislead.
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Rocky means nothing at such scales, they basically behave as viscous liquid. Also, temperatures don't matter much since the contact area would receive as heat all of the kinetic energy of thousands of cubic kilometers of rock coming to a stop.
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I know a guy:
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Depending on what you’re asking, it might just be gravity. Many (most?) asteroids the size of Bennu and Ryugu are “rubble piles”, loose aggregations of rock and gravel held together by gravity.
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Andy, could you please provide the evidence to say they are rubble piles ?
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Also things are porous and compressible such that low speed collisions (if indeed that's what happened) can result in compaction+sticking rather than bouncing.
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What Artem said
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