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How does the Cosmic Background Radiation that still fills the universe and the relative abundances of elements support the big bang theory?

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Answer:

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. In other words, we should expect the universe to be filled with radiation caused by the remnant heat from the Big Bang, known as the "cosmic microwave background" (CMB).

Step-by-step explanation:

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