Answer :
Final answer:
The Hubble expansion and cosmic microwave background radiation support the Big Bang theory.
Explanation:
One piece of evidence in support of the Big Bang theory is the Hubble expansion. On average, we see galaxies moving away from each other as the space between them stretches. The cosmic microwave background radiation (CMBR) is microwave radiation that permeates all of space, and its discovery supports the Big Bang theory of the origin of the universe.
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