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During the zeptosecond at the beginning of the universe, the temperature was extremely high with energy levels beyond our current understanding. Subatomic particles like quarks and electrons had not yet formed, and the fundamental forces of nature were unified. It set the stage for the rapid expansion and cooling that eventually led to the formation of atoms and the universe as we know it.

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Q: What happened at the zeptosecond-the millionth of a trillionth of a second-the big bang began?
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