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Originally Posted by Fazor
"Coincidence" is not generally a very friendly term in science; was wondering if there's a reason why? Or if not, what current theories suggest.
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General relativity is founded on the assumption that this is not a coincidence at all. Instead, Einstein treated gravity not as a force, but as a curvature of spacetime, with all objects following the nearest thing to a straight line in curved space. That ends up with all objects accelerating equally, regardless of mass.