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In the Big Bang theory, what happened to temperature as the early universe expanded?

Answer and explanation

Correct answer: Temperature decreased

According to the Big Bang theory, as the universe expanded, its energy spread through a larger volume. Therefore, the temperature fell and the universe cooled. It did not remain constant because energy density decreases during expansion. Exam tip: remember that expansion of the universe is associated with cooling.

Related tags

Big Bang TheoryEarly UniverseUniverse ExpansionCosmic CoolingOrigin Of EarthEarly And Modern TheoriesThe Origin And Evolution Of The EarthGeography

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