From the pov of a photon travelling at the speed of light, no time elapses from the moment it emits from the sun and absorbs in my eyeball. This is true also of all photons going all directions off the sun. This implies there is no distance either, for the photon, in any direction. So does this imply that from the point of view of a photon, is it’s universe a single dimensionless point? That is, for a photon, is it existing in a pre-big bang universe? And further, since there is at least one photon, surely there isn’t space for more than one …. And since it’s the same universe we occupy with that one photon (viewed through differing points of view), is all light that one photon, possibly superimposed countless times?
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I think one of the stranger implications is that for a photon of the cosmic microwave background radiation reaching us from outer space, the entire age of the universe elapses in a single moment. Entire stars have been formed and died out, entire civilizations rose and fell, entire species came into existence and went extinct, and to those photons, all that time that elapsed while it was in transit was all a single instant because at the speed of light time comes to a halt.
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