Final answer:
Cosmic background radiation supports the Big Bang Theory by indicating the presence of heat in the universe.
Explanation:
Cosmic background radiation supports the Big Bang Theory because it indicates the presence of heat in the universe. The Cosmic Microwave Background Radiation (CMBR), which is microwave radiation permeating all of space, represents the glow of the early universe when it was much smaller and hotter, providing evidence for the Big Bang theory.
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