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Old May 17th, 2004, 11:13 AM
GJD GJD is offline
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Also, the first thing that happes when you start whamming asteroids into planets is that the crust melts, destroying most of your complex minerals and returning them to an undifferentiated melt. If you wallop a planet hard enough to shatter it, it shatters in a liquid form, as the energy tramsmission is quiet sufficent to render the solid into a liquid.

It is the act of planet forming, and the slow cooling and subsequent differentiation of that melt, that lets late-melt forming minerals appear. Smaller asteroidal bodies cool too quickly for the really interesting minerals to form.

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