What progress will mankind make in space development and space immigration?

Generally speaking, it is necessary to develop low-earth orbit bases and lunar bases first, conduct technical demonstration, and then expand outward. If we can break through the energy cost limit in the later period, we can consider the material transfer between planets and environmental transformation. However, the formation of stars is so capricious that it is difficult to find a livable planet, which hardly exists in the solar system. Take Mars as an example. Even in the livable zone, its volume is only 1/6 and its mass is only110 of the earth, so its atmosphere is very thin, and it is not suitable for direct breathing even after artificial transformation. Moreover, the magnetic field of Mars is extremely weak, and it cannot effectively fight against cosmic radiation, so even immigrants need to live in a closed base. More importantly, gravity is only 40% of the earth's, and people have lived on it for a long time, because bones do not need to bear the high strength on the earth, which will cause a lot of bone loss. If you do this for a long time, it will affect your life span and your physical appearance will change greatly, such as slender limbs, huge skull and pale skin due to lack of sunlight. Over time, you will become a real "Martian". At that time, new social problems will certainly appear, similar to the current racial barriers. This is just an example of Mars, which is closest to the Earth. Another possibility is to survive in the space station, build a huge rotating space station near the resource-rich planet, and simulate the gravity of the earth with centrifugal force. The technical requirements of this immigration method are much higher than those of planetary immigration. As for the others, there are many possibilities, such as connecting the spirit to remoulding people after digitalization, and exploring the time difference control through quantum communication technology, which is infinite.