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
Correct Answer:
Verified
Correct Answer:
Verified
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