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Thought Experiment

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if you separate one part of a quantum pair and keep it on earth and accelerate the other one to near c, will the one remaining on earth get smaller and more massive?

if you separate one part of a quantum pair and keep it on earth and accelerate the other one to near c, will the one remaining on earth get smaller and more massive?

It depends on which frame of reference you are in (and which definition of mass you are using)

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