Assuming the expansion of the universe will be dominated by dark matter, is there a limit to how far a photon could travel in terms of co-moving distance, as the Universe will be expanding faster than the speed of light.

  • $\begingroup$ The expansion of the universe is currently dominated by dark energy, not dark matter, and there is no compelling reason to think this will change. $\endgroup$ – G. Smith Nov 15 at 17:54

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