Will humans travel and immigrate in the future?

According to foreign media reports, what should we do if the earth "falls"? Some scientists with doomsday plots have been thinking about this problem. Meteorologists say it may be too late to take measures to reverse climate change and the earth will become uninhabitable. Interstellar migration may be our only option. For astrophysicists and fanatical sci-fi fans, interstellar migration is obviously very interesting and exciting, but if we really want to enter the stage of interstellar migration, we will face more difficulties. Is there a better way?

Science fiction describes the scene of space travel for us. Most interstellar travel is boring because there is too much space. The nearest proxima centauri is 4 light years away. Even light takes four years to reach. We are about 27,000 light-years away from the center of the Milky Way. If we go to Andromeda, it will take more than 2 million years. Unfortunately, Einstein's theory of relativity limits the emergence of superluminal, that is, the upper limit of the speed of light, and nothing can exceed the speed of light, so it is obviously impossible to create superluminal. If we will face interstellar migration in the next few hundred years, the current physics and engineering technology may not be able to meet the demand.

In the eyes of many science fiction writers, interstellar migration is not difficult, because wormholes and space-time distortion can solve this difficulty. In fact, wormholes are not what science fiction writers imagine, and wormholes are also allowed in physicists' equations. At least we found the feasibility of wormholes in mathematics. Everything we know today is based on the predictable Newton's law, but this law cannot bring mankind into a higher civilization. Even the best propulsion system can't realize interstellar travel, so we need to start from time and space and realize interstellar travel through time and space shortcuts. According to the current space technology, thermonuclear propulsion system is expected to appear in the foreseeable future, and our speed can reach several percent of the speed of light.

Before interstellar migration, we need to find a suitable planet. Astrobiologists believe that there is no shortage of livable planets in the Milky Way. On average, there is a livable planet in every/kloc-0.000 stars, but it will take some time to find a planet very similar to the earth. The problems we are facing now are still in a relatively basic stage, such as how to reduce the cost of space activities. Large-scale aerospace industry and reusable rockets will help us reduce the cost of entering orbit to an acceptable level, thus realizing the utilization of near-earth orbit resources, which is also an important step before interstellar migration.

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