Question

How does the change in the temperature of the universe provide evidence for universe expansion that supports the Big Bang Theory?
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2 points
The universe is warming which, according to the Big Bang Theory, is expected to happen as the universe shrinks
The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands.
The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe shrinks.
The universe is warming which, according to the Big Bang Theory, is expected to happen as the universe expands.

Answer 1

The correct answer is: The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands.

According to the Big Bang Theory, the universe has been expanding since its initial explosion. As the universe expands, its density decreases and the radiation and matter within it spread out. This spreading out results in a cooling effect. Therefore, the cooling of the universe provides evidence for its expansion, supporting the Big Bang Theory.