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Physics question by hagar2006-10-26 20:56:26
  Mu. by raptor_872006-10-26 21:08:31
    A photon itself may be assumed massless. by hagar2006-10-26 21:12:55
      Photons have zero rest mass by admeralthrawn 2006-10-26 21:24:53
but their relativistic mass when traveling at the speed of light is non-zero. Otherwise they couldn't be carrying energy. But an object traveling faster than light, if such a thing existed, would have an imaginary mass.
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