Maybe we should siphon off hydrogen and helium from the Sun for storage elsewhere in the Solar System to reduce the burn rate to prolong the usable lifetime of its fuel? And build a Dyson sphere. ;D

I've watched enough Doctor Who to know that being the last one alive at the end of time is pretty goddamned lonely. And dark.

You can have all of my poptarts, I'm likely to check out.

You've been watching too many bleak, post-apocalyptic, fatalist celebrations of losers. I'm talking about adding millions to billions of years of extra good life in the giant dome with plenty of temperature difference to keep entropy down for longer.

This won't stop the heat death of the universe, just prolong the life of one particular solar system a bit.