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As the universe expanded, what generally happened to its temperature?

Answer and explanation

Correct answer: It kept decreasing

The governing cosmological concept is expansion-related cooling. As the universe expands, matter and radiation become distributed through a larger volume, so the average energy density decreases. Radiation is also stretched to longer wavelengths, lowering its temperature. Therefore the general trend has been a decrease in temperature as the universe expanded. Option D expresses this cooling. The idea that temperature kept increasing is opposite to the standard model, and saying that it did not change ignores the effect of expansion on energy density and radiation. “Ended instantly” is not a physical description of cosmic evolution. The question asks for the broad trend, not a claim that every local region always cools at the same rate.

Related tags

GeographyUniverse-ExpansionCosmic-CoolingEarly And Modern TheoriesThe Origin And Evolution Of The EarthClass 11 Mcq

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