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This ice crater and even the existence of this solid ice moon so close to Saturn are both still puzzles! PIA06582: Herschel: Dead-On Herschel crater is on the ice moon Mimas with a surface gravity of only 0.064 m/s^2 (0.00648 Earth g). With a density of only about 1.15 g/cm^3 Mimas is thought to be mostly ice, but mixed with other material. The other ...


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I've noticed this before, too. My non-professional assessment is that it is a viscoelastic response to the impact, where the energy of the impact temporarily transforms the surrounding geology into a viscoelastic material. The central peak is essentially a rebound product of the impact. I'll venture that the peak of molten material solidified before it ...


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In the extreme energy of a large impact, the rock behaves like a liquid (It isn't actually completely melted, though some is. The extreme forces cause the rock to flow). As the impactor hits the moon, rock is pushed out, and since it is surrounded by relatively solid rock, it is pushed up. Then gravity takes over as the rock that has been pushed up now ...


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