How Does the Existence of Dark Energy Affect the Expansion

question 23

Multiple Choice

How does the existence of dark energy affect the expansion of the universe?

• A) It is possible for the mass density of the universe to be below the critical density and still collapse.
• B) It is possible for the mass density of the universe to be below the critical density and still expand forever.
• C) It is impossible to have a collapsing universe, regardless of its density.
• D) It is impossible to have an expanding universe, regardless of its density.
• E) It is impossible for the mass density of the universe to be above the critical density and still expand forever.

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