How does weak background radiation coming from every direction in the sky support the Big Bang theory

Question

It provides evidence of universe expansion
It provides evidence of universe contraction
It provides evidence of the universe’s decreasing mass
It provides evidence of the universe’s increasing mass

Answer 1

The weak background radiation coming from every direction in the sky is known as the Cosmic Microwave Background (CMB) radiation. This radiation provides strong support for the Big Bang theory because it represents the afterglow of the hot, dense state of the early universe, approximately 380,000 years after the Big Bang when the universe became transparent to radiation.

Therefore, the correct option that explains how this background radiation supports the Big Bang theory is:

It provides evidence of universe expansion.

The CMB is a uniform background radiation that is consistent with predictions made by the Big Bang model and demonstrates that the universe has been expanding since that initial event.