When will man leave the solar system?

This will depend on the level of human scientific and technological development.

Five billion years is a long process, and the history of human civilization is only over 5,000 years. I believe that by then, human science and technology will be highly developed.

Since we refuse to evaluate the possibility of negation and negation, let's talk about the good development direction:

1, looking for a new home. There are about 654.38+000 billion stars in the Milky Way, so we must find a planet in the livable zone, with a temperature and climate suitable for carbon-based life, and it is best that this planet is still in the early stage of life evolution, without advanced intelligent life, just like the earth 654.38+035 million years ago, with a dense atmosphere rich in oxygen, suitable temperature, lush plants and primitive low-level animals. We are immigrants, not invaders. Protecting the legitimate rights and interests of aborigines must be the minimum feature of advanced life. )

2. If the star is in the best stage of the main sequence star, it can last for at least 5 billion years. If it is a red giant, it will only last about 654.38+0 billion years, and then it will continue to immigrate. Fortunately, 65.438+0 billion years is not a flick of a finger, at least it can let human beings have a rest, find the next foothold, and also spend countless sunsets in the afterglow of the sunset.

3. Having a destination is a question of how to immigrate. Look at the distance of this "super earth". By then, human civilization will certainly realize interstellar travel. The distance of tens of millions of light years is natural for human high technology. It will certainly carry the genetic map of all living things on the earth and be reborn in a new home, but it will not completely disrupt the original ecology.

4. Before emigration, it is natural to send vanguard troops to clean up new homes, build a new Beijing or new york, and gradually immigrate the earth's population (even 6 billion) in batches. The rich and powerful go first, and the poor go last:) Alas, I hope that with the development of human scientific and technological civilization, social civilization is also highly developed, with no class gap, no survival problems and social harmony. . . The solar system where the earth is located is located at the periphery of the Milky Way, about 20,000 light years away from the edge. Even the vertical distance is 1000 light years. Manned to leave the Milky Way this very long distance space travel, now can only be imagined in three ways:

The first method is to build a spaceship flying near the speed of light. At this high speed, the effect of relativity makes the astronauts sitting on it fly out of the Milky Way only for decades.

The second method is to use the current technology to build a "snail" spacecraft (about one thousandth of the speed of light), plus human freezing, to slow down or even suspend the metabolism of astronauts until they reach their destination (this is how astronauts travel in space in the movie Alien).

The third method is to use the "snail" spacecraft, but a biosphere with self-sufficiency in air, water and nutrients is built in it, where astronauts live and multiply, and the journey is completed by the relay of "fools moving mountains".

But in either case, astronauts are doomed to bid farewell to the relatives and friends of the earth forever, so it is extremely inhuman, and the results of exploration will reach the hands of earth scientists in the very distant future. Therefore, unless you really find a shortcut to time and space and use it, the possibility of such a trip is very slim.