How does the change in the temperature of the universe provide evidence for universe expansion that supports the big bang theory?
The universe is warming 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 to happen as the universe expands
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The correct statement is that the universe is cooling, which supports the big bang theory and the idea of universe expansion. According to the theory, the universe began as an extremely hot and dense state, and as it expanded, it also cooled down. This cooling can be observed through the measurement of the cosmic microwave background radiation (CMB), which is essentially the residual heat left over from the early stages of the universe. The CMB temperature is currently measured to be around 2.7 Kelvin, which aligns with the prediction of a cooling universe as it expands. This observed cooling of the universe provides evidence that supports the big bang theory and the concept of an expanding universe.
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