errr... this isn't quite right. We know that many (most ?) asteroids are largely solid. It's maybe also true that their surfaces are covered with gravel.https://twitter.com/cuddigan/status/1182344306180247553 …
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This stuff is fascinating! If you have cool resources for me, definitely send it my way :D
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my investigations are quite scattershot and very weird motivated - writing science fiction novels, so I end up doing searches like "retrograde orbits" and "binary Trojan asteroids", then skipping sideways from there...
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