Astronomers refer to a certain period very early in the history of the universe

Question

Astronomers refer to a certain period very early in the history of the universe as the Dark Ages, because almost no light survives from this period, due to the universe consisting at that time of dark matter and hydrogen and helium atoms. [The atoms absorbed light.] Roughly what were the boundaries of these Dark Ages, in terms of the age of the universe at those times?

1. 10^30 sec to 10^6 sec.

2. 900 million years to 2 billion years.

3. 380,000 years to 550 million years.

4. A millionth of a second to 3 minutes.

5. 550 million to 900 million years.

Explanation / Answer

Astronomers refer to a certain period very early in the history of the universe as the Dark Ages and the period range from

3. 380,000 years to 550 million years.

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