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How hot was the early universe?

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Anonymous

15y ago
Updated: 8/17/2019

A few minutes into the expansion of the big bang, the temperature was about a billion kelvins

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Wiki User

15y ago

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Why is the cosmic microwave background (CMB) so cold despite the early universe being so hot?

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Where did the cosmic microwave background (CMB) come from and what does it reveal about the early universe?

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What is the first thing in the universe?

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