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[quote=sjastro;432572]Since the Earth is not sufficently massive to cause space-time to curve, the surrounding space is flat and the geometry must be Euclidean.
Is there a critical mass that makes space curved? the closer one gets to a centre of mass no matter how small, the more curved space-time gets. The further one gets from a centre of mass no matter how large, the "flatter" space-time gets.
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