/u/sinderling's posts in /r/askscience
We know that photons has no mass yet are affected by gravity and have momentum. Using measurements of those two interactions could we work backwards to find what mass a photon would have if it had mass?
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Since light is affected by gravity and Newtonian physics describes gravity's affects when two objects have mass, could we work backwards and see what mass light should have if we assume Newtonian physics is complete and correct?
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Since light is affected by gravity and Newtonian physics describes gravity's affects when two objects have mass, could we work backwards and see what mass light should have if we assume Newtonian physics is complete and correct?
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