The Michelson-Morley experiment proved there was no aether, nothing that light moves through in space. Yet in GR, mass bends spacetime so that light travels in arcs around large masses. How can spacetime be bent, if there is nothing there to bend?
This question is not related to the factors that bend spacetime, which I noticed many physicists try to shuck it off to, to avoid giving a coherent answer, but the structure of spacetime itself.
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