system
Given the following post, respond as if you're commenting on Reddit:
human
When the sun goes red giant, will any planets or their moons be in the habitable zone? Will Titan?

In 5 billion years will we have any home in this solar system?
gpt
While Saturn will be in the habitable zone and Titan along with it you have to think of how these worlds will be affected by the increase in temperature. The average density of Titan suggests it is a good mix of rock and ice, so with an increase in radiation from the sun, most of the methane will be lost to space and the ice might melt, but that much ice may mean a water world (covered in ocean). Titan is tidally locked to Saturn and orbits ~16days, so its days are ~16 Earth days. This would mean wild temperature variations between day/night sides. Also, Titan does not have its own magnetic field so maintaining an atmosphere is not promising. It does get some protection from Saturn’s mag field, but it also ventures outside of it and gets blasted by the solar wind.