Eventually...long after we've likely become extinct or evolved into something else, the sun will turn into a red giant and then shrink into a white dwarf.
This will destroy Earth. But it might not be the end of the solar system's story. The math allows for the possibility that planets in the outer system might be pulled inwards as the sun collapses...into the habitable zone.
And then the sun will stay that way for billions of years. There's a plotbunny to tease out here...
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