At About What Time After the Big Bang Did the Universe

question 148

Multiple Choice

At about what time after the Big Bang did the universe pass through the transition from being radiation-dominated to being matter-dominated?

• A) at the Planck time, 10^-43 s
• B) about 15 billion years, as stars began to form
• C) 500,000 years
• D) 30,000 years

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