If you run the big bang model far enough into the past, you arrive at a singularity. Near that point, relativity starts to break down, and we don't really know what physics looks like.
For unrelated reasons, we cannot see back past further than about 10^-6 seconds after the big-bang, because the universe prior to that point was so hot and dense that photons would be reabsorbed almost immedietly.
Once you avoid everything being in literally the same place, the problem just becomes having the photon move towards us faster than the expansion of the universe.
For unrelated reasons, we cannot see back past further than about 10^-6 seconds after the big-bang, because the universe prior to that point was so hot and dense that photons would be reabsorbed almost immedietly.
Once you avoid everything being in literally the same place, the problem just becomes having the photon move towards us faster than the expansion of the universe.