NOTE: may be inaccurate. Feel free to photoshop your variants.
It doesn’t. It’s not massive enough. It turns into a red giant, then collapses into a white dwarf and eventually fusion basically stops.
Alternatively, if we wait long enough we always have the heat death of the universe to look forward to.
I read in this book that there’s a restaurant just before that happens where you can bounce back and forth between the death of the universe and the hours before it. So that sounds cool.
Shh!" said Ford. “It’s conical. So what you do is, you see, you fill it with fine white sand, alright? Or sugar. Fine white sand, and/or sugar. Anything. Doesn’t matter. Sugar’s fine. And when it’s full, you pull the plug out… are you listening?” “I’m listening.” "You pull the plug out, and it all just twirls away, twirls away you see, out of the plughole. “Clever.” “That’s not the clever bit. This is the clever bit, I remember now that this is the clever bit. The clever bit is that you then thread the film in the projector… backwards!” “Backwards?” “Yes. Threading it backwards is definitely the clever bit. So then, you just sit and watch it, and everything just appears to spiral upwards out of the plughole and fill the bath. See?” “And that’s how the Universe began is it?” said Arthur. “No,” said Ford, "but it’s a marvelous way to relax.
Realistically speaking, any of the major changes that happen near the end of a star’s life will make their planets uninhabitable on a time scale that seems pretty long from a human perspective. Imagine the last 100 years of climate change, but it just keeps getting worse at the same pace for a million years. By the time a star swells into a giant or explodes in a supernova, there won’t be anyone around to notice.
