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seen Oct 12 '13 at 12:46

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comment Finite or ∞ set of masses & ∃ gravity center?
@BenCrowell That's my point. It's an idealisation that's not to be taken too seriously. The deeper the question you want to answer, the more honest you have to be.
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comment Can a rock be considered frozen
Note: the phase diagrams of He3 and He4 are quite different.
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answered Einstein-de Sitter - confusing constant of integration