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Re:Transfer of atomic mass with a photon solves the momentum... by sandworm101 on Sunday July 02, 2017 @11:15AM (#14682843)
There are some very good ways. Thats how redshifting was proven in the first place. Cephiads (sp), pulsing stars, were used to prove that galaxies were a thing. They give very accurate distances at ranges where redshift is detectable.

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