In an orbit about 400 kilometers from the earth, the Tiangong Space Station "camped" here and circled the earth for about 90 minutes. Tiangong Space Station (also known as China Space Station) is a modular space station system built in China from 202 1.
As the third large-scale in-orbit space experimental platform built by human beings after 1986 Mir Space Station and 1998 International Space Station. The basic configuration of the space station includes three parts: Tianhe core module, exploration module and dream module. The establishment of the space station not only shows that China has made a major breakthrough in aerospace, but also improves the quality of life of ordinary people and the right to speak of the country.
The reason why the space station runs in a 400-kilometer high orbit;
1. If the space station flies to a higher orbit, it needs to consume more energy, which is a great test for the carrying capacity of the launch vehicle. If you want to carry several tons of equipment to a higher height, it is unnecessary and the cost is too high.
2. Generally, space experiments need an environment close to vacuum, the advantages of telescope observation without clouds, and experimental conditions close to zero gravity. And the height of 400 kilometers can also be satisfied.
3. Considering the launch cost, observation demand, astronauts' health and the safety of aircraft, instruments and equipment, scientists set the flying height of the space station at about 400 kilometers.