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When the Big Bang began, all of the fundamental forces were unified and behaved like a single force. ...

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When the Big Bang began, all of the fundamental forces were unified and behaved like a single force. ...

When the Big Bang began, all of the fundamental forces were unified and behaved like a single force. As the universe expanded and cooled during the Big Bang, when did gravity first become a separate force?
A)   At the start of quark confinement, when the universe was about 10–6 sec old
B)   At the start of the inflationary period, when the universe was about 10–35 sec old
C)   At the end of the inflationary period, when the universe was about 10–33 sec old
D)   At the Planck time, when the universe was about 10–43 sec old

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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