Final answer:
Cosmic Background Radiation and redshift of galaxies suggest the universe was once warmer and smaller, supporting the Big Bang theory.
Explanation:
Cosmic Background Radiation and the redshift of galaxies provide evidence that the universe was once warmer and smaller. The Cosmic Microwave Background Radiation (CMB) is a key piece of evidence supporting the Big Bang theory, indicating that the universe was once in a hot, dense state before expanding and cooling.
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