At What Times During the Big Bang Were All Four

question 17

Multiple Choice

At what times during the Big Bang were all four fundamental forces unified?

• A) until 10-²⁴ s, after the start of the Big Bang, when the inflationary era ended
• B) during the first 500,000 years from the start of the Big Bang, when the universe was dominated by radiation
• C) until 10-⁶ s after the start of the Big Bang, when the era of quark confinement ended
• D) during the Planck era, up to 10-⁴³ s, after the start of the Big Bang

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