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by xiler
2554 days ago
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IIRC objects experiencing acceleration (e.g. planets orbiting each other) are not subject to Galilean relativity like objects that are moving at a constant velocity (e.g. ball being thrown on a train). So when planets orbit each other, there is only a singe valid frame of reference. See: https://en.wikipedia.org/wiki/Mach's_principle |
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