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How dense was the universe when it was 1 million years old?

How dense was the universe when it was 1 million years old?

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Expert Solution

The Big Bang Model postulates that the density of the universe was infinity just when the big bang started. It became finite and reduced gradually as the universe expanded. There are three era in the Big Bang hypothesis: Radiation Era, Matter Era and Dark Energy Era. The early universe was dominated by radiation. Radiation Era is the time when radiation dominated in the universe. The Matter Era is the time when matter dominated in the universe. The Dark Energy Era is the time when the Dark Energy dominated in the universe.

Radiation era lasts from 0s to . At the end of the radiation era, density of the universe is . In the first epoch of matter era, which lasts from to , density of the universe changes from to . The time 1 million years lies in this epoch and by intrapolation, we can approximate the density at time to be around . Thus, the universe was approximately dense when it was 1 million years old.

genius_generous answered 1 year ago
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