0x1 - Cheat Sheet - Mysteries of the Universe

Suppose you are out with a group of friends gazing at the night sky and someone says, did you know that they just found a black hole at the centre of our galaxy and someone else mentions dark matter or the whole universe was smaller then an atom the instant before the big bang. No your friends aren’t Astor Physicists, they probable just have a good cheat sheet and now its your turn.