How do we use expansion rate to estimate the age of universe


Problem

A. How do we know that the universe is expanding, and how do we use the expansion rate to estimate the age of the universe?

B. Describe the role that dark energy plays in the expansion of the universe.

C. Describe what the universe was like during the first few minutes after the Big Bang. How do the contents of the early universe change as the temperature of the universe decreases?

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