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Last Post 3/24/2021 5:44 AM by  Terry Kucera
Sun brightness changes?
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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,

    Terry Kucera
    Basic Member
    Posts:328 Basic Member

    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.

    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!
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