If Space Were Flat and There Were No "Dark Energy

question 5

Multiple Choice

If space were flat and there were no "dark energy," what would be the future of the universe?

• A) The universe would hardly expand forever; if it had any more matter in it than it does, it would eventually stop expanding and start to collapse.
• B) The universe would expand to a maximum size and then collapse into a Big Crunch.
• C) The future of the universe is not related to the geometry of space.
• D) The universe would have more than enough energy to expand forever, not stopping, even when infinite time has elapsed.

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