Astronomy Chapter 23 Visual Activity

During the history of the universe, what important even occurred about 0.001 seconds after the big bang?
Most matter in the early universe was annihilated by antimatter.
Which of the following important events occurred earliest in the history of the universe?
Spacetime rapidly expanded during a brief period of inflation.
During the history of the universe, what important even occurred about 380,000 years after the Big Bang?
Light began to travel freely through the universe.
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Essentially all the hydrogen nuclei that will ever exist in our universe was created __________.
by the time the universe was about 3 minutes old
Compared to when the cosmic microwave background was first released, the radiation of the cosmic microwave background today is __________.
fainter and has most of its photons at longer wavelengths

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