What did the cosmic microwave background tell cosmologists about the early universe?
A)Nothing; it is a product of the black hole in the center of our own Galaxy.
B)the horizon problem, in that the microwave background is almost too isotropic
C)the discovery of dark energy and its role in accelerating the universe
D)the discovery of relativistic redshifts and the Big Bang
E)The dark matter in the universe is mostly baryonic in nature, for a closed Big Bang.

Question

Quizplus · Accepted Answer

The cosmic microwave background showed that the early universe was almost too isotropic, indicating a problem with the standard cosmological model known as the horizon problem. The cosmic microwave background showed cosmologists that the universe was almost too isotropic, meaning that it had a uniform temperature and distribution of matter on a large scale. This posed the horizon problem, which suggested that the early universe underwent a period of rapid expansion known as inflation.

What Did the Cosmic Microwave Background Tell Cosmologists About the Early