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That simply means that there is NO WAY to define or measure an "absolute motion".Any experiment you do will be the SAME for different observers - in the sense that it is unaffected by relative velocities.

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6y ago
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6y ago

It need not be. With respect to you, as the observer, the sun, moon and stars are moving around the earth. I hope you do not still believe in the geocentric universe!

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Q: Why must motion be with respect to the oberver?
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