Anonymous-USA t1_jcni8or wrote on March 18, 2023 at 2:55 AM

Reply to comment by decrementsf in Where do photons go if they've been emitted but are destined to never be absorbed, and would these photons traveling ad infinitum define the edge of the universe (even if space itself were still larger)? by mysteryofthefieryeye

Assuming that’s true, a photon could never circumnavigate the universe because the event horizon for that random photon is expanding faster than light speed. It can’t ever catch up. Any random photon anywhere in the universe at this moment has a 46B light year event horizon in all directions. And the universe itself (regardless of its geometry) is larger than the event horizon anyway.