Originally Posted by nighthawk
Photon get tired? Can't imagine how that would work. Law of conservation of energy. We have some very old photons to investigate in the form of cosmic background radiation (Penzias and Wilson). Nobody's reported anything hinky about them as far as I know. Now there's your red shift - all the way to microwaves.


CBR is very red shifted from scattering. [not the original photons]


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