next up previous contents index
Next: Big Crunch? Up: Big Bang Previous: Cosmic Microwave Background

Light Elements

It is an observed fact that most of the matter in the universe are the three lightest elements: hydrogen, helium, and lithium. These elements were present during the initial formation of the universe, with the heavier elements being later formed in massive stars. The big bang model predicts, to a very good degree of accuracy, what the relative abundance of these three light elements should be.