If it is 5 billion years later and the sun and the earth are aging, how can humans get out of the earth?

First of all, with the current level of technology, we can't completely get rid of bad luck, but we can also ensure the survival of some human beings, so we need great progress in science and technology.

First of all, with current technology, it is unlikely to move to other galaxies. Even the centennial starship program in the United States will take another hundred years, right? However, in the19th century, a technical idea was put forward, that is, the idea of a city in the sky, which can be basically realized with the current technology, and a large habitable space station can be built to create gravity by its own rotation. So as to avoid the impact of weightlessness on health, and then the space station will still revolve around the sun in the solar system, but only at a suitable distance. Of course, I'm afraid the scale of the space station that can be built with the current human technology is really limited, far from the city level, but when human beings face life and death, they may explode with great potential. Relying on the solar system without escaping from it is not ideal, but it also needs a lot of technical and industrial support. For example, if humans set up an industrial base on the moon or have the technology to develop asteroids, they can make the city of the sky bigger and stronger.

The next step is to fly out of the solar system according to the American centennial starship plan. Then we need to try our best to build at least controlled nuclear fusion nuclear reactor in space, and have relevant generator technology, so as to push the city of the sky out of the solar system and have enough energy to cope with the cold space during tens of thousands of years of space navigation. In fact, the above two ideas are not ideal. But it is predictable with today's technology.

Of course, if we are given enough time, it is not impossible to break through technologies such as anti-gravity space navigation, wormholes in time and space or hyperspace folding. With such a technical foundation, it is easy to sail the universe and find a new life planet, and migration is similar to conventional relocation. But with the current technology, I'm afraid it will take more than a thousand years.