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Gravity is not instantaneous. It moves at the speed of light. And the “speed of light” can only be measured locally, because the time and space at a point are curved. The path of light corresponds to “null geodesics” in spacetime, and a body traveling along the geodesic experiences no time elapsed.
Gravity is not instantaneous. It moves at the speed of light. And the “speed of light” can only be measured locally, because the time and space at a point are curved. The path of light corresponds to “null geodesics” in spacetime, and a body traveling along the geodesic experiences no time elapsed.