Quoted By:
well that isn't really something that encircles the universe like a shell, it permeates through it
beyond the distance the background microwave radiation has travelled there is presumably empty space as nothing, not even photons going the speed of light, have had enough time to travel there
it is unfathomable to imagine crossing the boundary as there is no way we could go faster than the photons going the speed of light and the radio waves further dispersing at the boundary of the observable universe
