Watch QuickTime video:
History of our Universe

First 3 minutes.

All the hydrogen atoms in the universe are formed now - including all the ones in your body. If the universe had remained this hot and dense for much longer, the hydrogen would all have been cooked into other chemical elements. Without hydrogen, there would be no water, and therefore no life as we know it. We understand the aftermath of the Big Bang very well.

Scale of window: 330 trillion miles across.