If humans want to emigrate to other planets, what difficulties will they encounter in the process?

It is too difficult for human beings to migrate to other planets, at least in the short term. There are too many problems when they really migrate, but personally, the main problems can be divided into two aspects, one is human problems and the other is environmental problems.

The problem with people themselves is that people suddenly moved to such an environment. How do they get there? How long will this process take? Is it safe enough? Now space technology may be gradually developed, and it is very simple to send a person into space. But if billions of people are sent from the earth to another planet, mankind must come up with a safer, more reliable and lower-cost mode of transportation to transfer people from the earth to another planet. Although it is simple to say, it is not easy to do, because the ability to launch spacecraft is now based on high-cost support, and real immigrants can't do this.

The environmental problem is that people have moved to another planet. You must find that this environment is completely different from the earth, and you are not familiar with it. There are mountains and lakes on the earth, and there are many trees that have grown for many years. You may be used to seeing these things and suddenly come to a bare planet. Although I can live, eat well and wear warm clothes, and have my own normal pace of life, I always feel that life is very heavy and I can't find one as beautiful as the earth.

Of course, there are many other problems, but to be honest, we are still a little far from considering so many sentences, because it will take half a year for humans to explore Mars, and the flight speed of manned spacecraft is too slow. If you really want to find a planet suitable for human habitation outside the solar system, at the current speed of the spacecraft, it may take several years, and normal people can't wait, and the cost is so high. It will be difficult to do this in the next few decades or even hundreds of years.