1. What are the origins of the helium found in the universe? 2. To what event in the history of the.

1.       What
are the origins of the helium found in the universe?

2.       To
what event in the history of the universe can the cosmic microwave background
radiation be traced? Was the radiation always in the form of microwaves? If
not, what happened to change the wavelengths of the original radiation?