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Old March 31 2013, 11:31 PM   #9
Location: Kentucky
Re: Speed of light is not perfectly constant in vacuum!

If there were any significant random variations in photon velocity, then when a telescope looked at a distant galaxy or other object moving with a high translational speed, the object's image would be smeared. The position of early arriving photons would not match up with the position of the laggards. This effect should put a bound on how much the velocity could be varying on a macro scale.
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