1. Where do astronomers believe most of the photons in the cosmic microwave background originated? 2. Give examples of the actions or roles of each of the four basic physical forces in the universe....

1. Where do astronomers believe most of the photons in the cosmic microwave background originated?

2. Give examples of the actions or roles of each of the four basic physical forces in the universe.

3. What is the observational evidence for the a. Big Bang, b. inflationary epoch, and c. confinement of quarks?