Hi:
Cosmologically "c" is closely tied to the mass of the universe. If the
mass changes, so does "c"...but if the mass of the universe changes more
than just a hair, the universe becomes uninhabitable.
The photon universe does not communicate at the
speed of light, it communicates instantly, for time as we perceive it ceases
to pass at the speed of light. (action at a distance)
Photons are not mass less in an Einsteinian
universe, nor is the mass of an Einsteinian universe infinite.
Regards, Sam Cox
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