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Last Post 3/24/2021 5:44 AM by Terry Kucera

Sun brightness changes?

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Rohit

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3/23/2021 11:11 AM
Hi there! Does the sun's brightness change over time, please? Thank you very much, Rohit

Terry Kucera

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Posts:328

3/24/2021 5:44 AM
Hi Rohit, The sun's total over all brightness changes a very, very small amount - about 0.1% over the course of the eleven solar cycle. That is such a small change it is very hard to measure, but we have special instruments in space that can do it. See https://www.nasa.gov/topi...lory_irradiance.html Over much longe time scales - billions of years, we think it changes quite a bit. Over the last 4.5 billion years we thing the sun has become about 30% brighter - but that is not something we'd notice on human time scales!