How much cooler was the sun 4 billion years ago?

If it was not cooler than how much hotter?

Morningfox2012-10-01T14:48:17Z

Favorite 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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