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I have read popular accounts about the future predictions (the far future--a billion or so years from now) for our sun, and they say that as the sun ages, it will begin to expand and get hotter, eventually making Earth too hot for life.
Is there a simple explanation for why the sun, after being stable for a few billion years, would start expanding and getting hotter?
Is there a simple explanation for why the sun, after being stable for a few billion years, would start expanding and getting hotter?