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From: JeffRelf.F-M.FM on 23 Apr 2010 17:17 Rest·Mass is “spun up” photons, apparently. For example, when gamma ray “photon jets” collide, they form electron·positron pairs. Likewise, a blue·shifted ( spun up ) photon might gain rest mass... but it's undetectable, so far. Perhaps added rest mass keeps photons moving at c and only c. |