However, many people are curious about the landing of astronauts. For example, why do astronauts sit in a chair for interviews, and why can this chair lie down instead of sitting as in the past?
I don't know if you have noticed a small detail. Every time a manned spaceship returns to Earth, the astronauts need to sit in a chair and meet everyone. What's the reason?
The reason is that we once again realized the greatness of astronauts. This is because the space environment will lead to the loss of bone mass and muscle atrophy of astronauts to varying degrees.
As we know, China's space station runs in an orbit 400 kilometers away from the Earth, where the environment is completely different from the Earth, especially in terms of gravity.
On the surface of the earth, our muscles and bones have been fighting gravity, and they have adapted to the earth's environment. In the microgravity environment, the muscles and bones of the human body no longer need defying gravity, and they are in a relaxed state for a long time, while our muscles and bones are "used in and discarded". If it is not used for a long time, astronauts will have different degrees of muscle atrophy and bone loss.
But don't worry, after the astronauts return to the earth for a period of time, the muscle and bone mass will slowly recover.
In order to make astronauts adapt to the earth's environment more quickly, there are many fitness equipment in China Space Station. In order to delay bone loss and muscle atrophy, astronauts must exercise regularly. But even so, three months of space life will still have some impact on their bodies, so when they first return to the earth, their bodies may be difficult to adapt to the gravity of the earth for a while and need the help of staff.
In addition, astronauts will also have problems such as cardiovascular system in microgravity environment, because in microgravity environment, the blood of the heart is more likely to flow to the brain, and in the long run, the cardiovascular system will deteriorate. If it is carried out in space for too long, the cardiovascular system may be difficult to adapt to the earth.
In addition, when astronauts land on the earth in the return capsule, they will experience a large acceleration of gravity, which will also have a certain impact on their bodies. At this time, the astronauts are weak and difficult to stand for a long time, and they need the help of the staff.
In order to help astronauts readjust to the gravity of the earth, the search and rescue team prepared a chair where they could lie down.
Why do astronauts need medical isolation for a week?
After the three astronauts return to earth, they still need medical isolation for about a week.
Many people may have questions about this. There is no virus in space, so why medical isolation?
This is actually because astronauts will live in the space station for three months. Although the space station and extravehicular spacesuit can isolate some ultraviolet rays and high-energy radiation, they are not as safe as the earth's environment after all, and the radiation is still larger than the earth, which may lead to genetic variation of microorganisms. If genetic variation leads to strong pathogenicity of microorganisms, it is not good for human beings.
On the other hand, astronauts stayed in space for three months, and the space environment also reduced their immunity. Common germs on earth may also cause astronauts to get sick. In order to protect the health of astronauts, it is necessary to isolate them. After the astronauts' immunity is restored, they will enter the next stage of medical recuperation for 20-30 days. During the medical recuperation, astronauts will stay in places with good weather and beautiful scenery. At this time, astronauts will be under the guidance of doctors.
Finally, astronauts will have a recovery period lasting about 3 months. If they recover well, they can start normal daily training.
From the launch of the astronaut's rocket to the mission of the space station, and then to the return to Earth in the return capsule, every step of the astronaut is very difficult and deserves our respect.