At First, Right After the Big Bang, the Universe Was

question 19

Multiple Choice

At first, right after the Big Bang, the universe was too hot for nuclei and electrons to combine into the kinds of neutral atoms that are familiar to us today. How soon after the beginning did it become cool enough for neutral atoms to form?

• A) 10^-43 seconds
• B) 3 minutes
• C) a few hundred thousand years
• D) a billion years
• E) only last Thursday

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