The cosmic microwave background gives us a view of the universe when it was
A)14 billion years old.
B)about 1 million years old.
C)380,000 years old.
D)3- 5 minutes old.

Question

Quizplus · Accepted Answer

The cosmic microwave background radiation was emitted when the universe was about 380,000 years old, after a period known as the "recombination era." This radiation has been traveling through space ever since, making it a valuable tool for studying the early universe.

The Cosmic Microwave Background Gives Us a View of the Universe