I still feel that a photon from an ancient galaxy has more time dilation than one from a more recent galaxy closer to usThat idea would put this topic into New Theories rather than cosmology. As @Halc says, there is no meaningful Ďtime for a photoní, so to speak of 2 photons having different time dilations is meaningless.
Just chat is not a good place to put questions like this one.
If you have a new idea or variation on an established theory then New Theories is the place.
If you have questions of clarification about the current understanding of dark matter or expansion of space then best to put them in the physics, astronomy, cosmology section.
@Zer0 you are on the right track. If you look at the SR equations you will see that as an objectís speed gets closer to the speed of light (relative to us) the time it experiences and distance travelled tend towards zero (important word that ). So to talk of any object travelling at the speed of light, relative to us, experiencing time is meaningless, such a traveller would arrive instantaneously, so again differences in time dilation are only possible for sub-light objects. Best not go there - there lies philosophy
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