Olbers' Paradox

If the universe is infinite and there are an infinite number of stars then every point in the sky should be a star. However, we observe the night sky as being dark not bright.

This has been attempted to be explained a few ways, that the universe is finite (not generally accepted) or the Big Bang means a finite amount of stars are observable because the universe is expanding (microwave background radiation, invisible to the human eye, seems to prove that).