If we still exist by then, and we did not have to endure some sort of catastrophe we couldn't handle, I wouldn't be surprised if we will be consuming entire stars as our primary source of energy.

By then maybe we will be able to build giant dyson sphere around the Sun that will reduce sunlight coming to our planet.

kristapsk

Alright, I take that 7.59 figure back. It's from a quick search engine search while I distracted myself from work with SN. But upon further looking at more sources online, they all seem to point to billions of years before Earth becomes engulfed by the Sun. We could be fucked much sooner though, probably several hundred million years from now from increased luminosity of the Sun, causing a rise in solar radiation. But only fucked if humanity is still around and still haven't been able to leave the Solar system.