How long will it take for humans to be able to colonize other planets? Make educated guesses. Don’t talk about technologies that are currently beyond the reach of humans.

LZ, this problem is relatively big, because migration occurs under various circumstances, such as: 1. The expansion of the universe while the earth is safe and sound. 2. Settling on alien planets while the earth is safe and sound. 3. The migration of human beings as a whole.

But no matter what kind of migration it is, the first thing to solve is neither water, food nor oxygen, but the problems of cosmic radiation and gravity. Because the former has been basically solved by humans, but if the planet where humans migrate (such as Mars) does not have an atmosphere to block radiation from the universe, even if it survives for one or two years, it will have an impact on humans, and humans will be in a constant state for a long time. It will lead to osteoporosis. It is estimated that the average life span of the space pioneers will be about 20 or 30 years old at that time, which is very optimistic. It is difficult to say whether aliens can give birth normally. These are things that humans are exploring. The above is still with the support of the earth. If the entire human race emigrates, this will involve ecological issues. A spaceship as big as your city cannot bear one-tenth of the people in your city, then you Calculate for yourself what the result will be? Human beings estimate that there will be no space transmission technology in the next 500 years. Then human beings can only rely on the most advanced antimatter energy to navigate the universe. Except for the sun’s closest constellation to the earth, Proxima Centauri. According to humankind’s current technology, even It will take 1000-2000 years to get there. . Humanity still has a long, long, long way to go. . . Although you may not be satisfied with this answer, the prospect of human migration is not optimistic. Migration and travel are really two different things. The scientific community can give a definition of the universe, but migration is just a talk, otherwise humans would not I will desperately look for another earth. Even the human migration in science fiction is full of loopholes. I think there is only one way out for human beings, which is to learn space technology and be lucky enough to find another earth. It’s difficult. By the way, if you want to spend tens of thousands of human years on a spaceship, I advise you not to think about it, you will definitely die.