As Currently Understood, What Happens to the Energy Density of Matter

question 83

Multiple Choice

As currently understood, what happens to the energy density of matter and the energy density of a cosmological constant as the universe expands?

• A) Both the density of matter and the density of a cosmological constant increase as the universe expands.
• B) The matter density decreases, but the density of the cosmological constant increases.
• C) The matter density decreases, but the density of the cosmological constant remains constant.
• D) Both the density of matter and the density of a cosmological constant decrease as the universe expands.

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