As I understand it the big bang happened "everywhere". It was not an explosion of matter, but a rapid and accelerating expansion of the space between matter. This is overcome by local gravity (solar systems / galaxies). If this assumption is correct, is there anything preventing or any theory supporting the fact that the universe is in fact infinite and we just can't see beyond 13.7bya? Perhaps there were an infinite number of galaxies that existed before our local big bang, they just exist outside our visible portion of the universe. What proof do we have supporting an edge of the universe other than "we can't see that far... yet". This really bugs me. I'd prefer to just think the universe is infinite, because even if it isn't there's one of three things - 1) Nothing 2) Empty Space (something) 3) Other Universes - outside our universe and it seems like more of a reality (cautious use of this word, heh) that we just can't see the rest of the universe. It seems logical to think that the radiation we interpret as the CMB is from distant stars/galaxies that lie beyond our visible portion of the universe that existed before our local "big bang". You can tell a few things here, and this probably stems from my ignorance on the subject; but I don't like a finite universe and I don't like the BBT as a theory of the "birth of the entire universe" but rather a theory of the "rapid expansion of localized space."