"In fact, how could you tell inside a space ship whether you are sitting on the earth or are accelerating in free space? According to Einstein’s equivalence principle there is no way to tell if you only make measurements of what happens to things inside!"
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Richard Feynman, in The Feynman Lectures on Physics, Vol. II (1964), 42-5 Gravity and the principle of equivalence
https://en.wikiquote.org/wiki/Equivalence_principle
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Equivalence principle
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