Prove that it is possible to build a relocation base on Mars or the moon.

Mars is a little far away, with low temperature, low oxygen content and thin atmosphere, which is not suitable for life on earth.

The moon is close, but it has no atmosphere, and its gravity is very small, and the temperature difference between day and night is very large, which is also not suitable for life on earth.

It is difficult and troublesome to establish immigration bases on these two planets. If it is Mars, it takes a lot of time to transform the Martian environment: oxygen production system, heat insulation system, water supply system, etc. The moon, it is better to build an underground base on the ground, there will be many difficulties and dangers.

In fact, it is necessary to establish an earth resource supply station on the moon (developing moon resources to supply the earth on the verge of resource depletion) and a space observatory (without atmospheric interference, the built observatory will see farther and clearer than on the earth; It can also be used as the first front line and early warning of the earth. The moon is so small, how many people can immigrate? In contrast, Mars is more suitable for a large number of immigrants (although it is not as big as the earth, it is bigger than the moon). Secondly, the farther Titan is also good. It is not only bigger than the moon, but also the only satellite with planetary characteristics in the solar system (with magnetic field and atmosphere, and liquid organic lake), which can be migrated and developed.