What did you learn about Cosmic Microwave Background?
Question #1:
The Cosmic Microwave Background is described as "isotropic radiation". What does this mean?
ANSWER: (click and hold) This means that the radiation is the same in all directions, or at least very nearly so.
Question #2:
Why do scientists study the Cosmic Microwave Background?
ANSWER: (click and hold) By observing the CMB, cosmologists can study the physical conditions only a few hundred thousand years after the Big Bang. This reveals much about the structure of the universe, its origin and evolution.