Both the earth and the sun have lifetimes. The earth is 4.5 billion years old, quite middle-aged. What will be the fate of mankind at that time?

This kind of question cannot be answered by copying and pasting. I don't think the development speed of human science and technology is enough for human beings to continue to multiply when the sun develops into a red giant. It can be said that the fate of mankind is closely related to the fate of the sun. When the sun becomes unstable, human beings can't run. Maybe you can say that when the sun develops into a red giant and devours the existing earth orbit, we should change the atmospheric environment of Mars or Titan to make it livable. But this process is too long. For billions of years, the earth has changed from uninhabitable to livable. And this process happens on the earth itself. Imagine that. It will certainly take longer to transform these two celestial bodies with rockets carrying raw materials. And human science and technology have basically developed to the limit. There must be no large-scale interstellar migration. Therefore, when the sun is old, it is also the time when the human population dies! Hope to adopt