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A comment on Einstein's description of gravity just got much harder to beat. Parent comment
This is not limited to photons, although the first part, "no mass" is due to the rest mass of photons being zero.
Two objects of any kind whatsoever have more mass going in different directions than going in the same direction.
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This is not limited to photons, although the first part, "no mass" is due to the rest mass of photons being zero.
Two objects of any kind whatsoever have more mass going in different directions than going in the same direction.