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From: Groups on 21 Jan 2010 19:30

Empirically, photons have no rest frame.
From: Inertial on 21 Jan 2010 20:45

<Groups(a)JeffRelf.F-M.FM> wrote in message
news:_@Jeff_Relf.Seattle.2010_Jan21.4.34pm.7k...
>
> Empirically, photons have no rest frame.

No *inertial* rest frame at least .. as light travels at 'c' in *every*
inertial frame, so there is no inertial frame where it is at rest. We can
conceptualize a frame travelling at c (and so a 'rest' from for some light)
... but it won't be an inertial one in which we can apply the rules of SR /
Lorentz Transforms.


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