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FlameCow
Lv 5
How much cooler was the sun 4 billion years ago?
If it was not cooler than how much hotter?
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- MorningfoxLv 79 years agoFavorite Answer
Four billion years ago, the sun was about 7% cooler than it is now. Then it was about 5,400 K, and now it is about 5,777 K. Not much of a difference.
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