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You are assuming, apparently, that in the beginning the universe was a body, with solidity, and unmoving before something acted upon it.  On the contrary, there is no evidence that matter even existed at the beginning.  Rather, the big bang says that the universe began as an infintesimally small point of energy with infinite density and temperature.  Energy is always in motion and has no mass, so in what way does the law of inertia apply?