Space Port for Space Immigrants

2/kloc-at the beginning of the 20th century, mankind will build spaceports in near-earth orbit, orbit around the moon, orbit of Mars and free points of the Earth-Moon system as transit stations for space passenger transport. During this period, there will be a survey ship flying around all the year round, and a transshipment ship will shuttle goods and personnel between the space port and the survey ship like a barge. After the completion of the near-earth space port and the Mars space port, a complete space transportation network will be formed. If human beings want to live, work, live and settle in the moon, Mars and spaceport for a long time, they must develop a completely self-sufficient biosphere, establish early outposts and bases and form a complete system for developing the solar system without relying on the earth.