So I read everywhere that everything was packed into an infinitely small space at the big bang. But then after some thousands of years the universe condensed enough to let electromagnetic waves travel through and these waves have been traveling 13.7 billion years to get here. The problem here is of course is that electromagnetic waves travel at the speed of light, so it would seem they would have to start off 13.7 billion light years away for this to be possible. Can this be because the universe has expanded so fast that this is possible? Or is it because the universe was already infinite at the first instance after the big bang, but none the less has had everything grow further apart since then?