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Why is cosmic background radiation used as evidence of the big bang theory of the origin of the universe?

A.

It corresponds to the temperature predicted by the big bang theory.

B.

It is emitted from a black hole at the center of the universe.

C.

Its wavelength is getting shorter, so it must be very old.

D
.

It is not very common, so it must be running out.

1 answer

The correct answer is:

A. It corresponds to the temperature predicted by the big bang theory.

Cosmic microwave background radiation (CMB) is a key piece of evidence for the Big Bang theory because it represents the afterglow of the hot, dense state of the early universe. The temperature of the CMB, which is about 2.7 Kelvin, matches the predictions made by the Big Bang model regarding the cooling of the universe as it expanded.