How do astronomers "look" at historic CMB? I have a few question regarding CMB (Cosmic Microwave Background): I am confused, when I look at this is this a 360 degree view or a normal one sided view? As recent study that shown the universe is flat, do astronomer did consider at which where the top and bottom side should laid when we are looking at CMB photo? I mean that the is "top and bottom" difference of our flat universe? And, how can we observed this historic CMB? I don't understand, thinking logically, since these radiation happened long time ago, how can we still can observed them? The easiest reason I can think about is that matters formed at far greater light speed expelled from big bang point and then re-observed the background radiation emitting of bid bang period. I know my idea here should be wrong, tell me whats really going on.