jadrian
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for example, if a star theoretically came into existence 10 light minutes away, would we feel its pull instantaneously? or would it take 10 minutes for us to feel its pull?
phyzguy said:It would take 10 minutes for us to feel the pull. Changes in gravity propagate at the speed of light. The easiest way to see this is by linearizing Einstein's equations of general relativity, so that the metric is a flat metric plus a small perturbation. Then it's easy to show that such perturbations travel at the speed of light and are called gravitational waves.