After the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.
Time taken for the universe to cool after the Big Bang
During the first moment, immediately 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.
In the first three minutes after the Big Bang, these protons and neutrons began fusing together, forming deuterium also known as heavy hydrogen.
Thus, after the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.
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