Successful landing
The Shenzhou XIII spacecraft successfully landed, and the three astronauts who stayed in space for 6 months also successfully completed the manned mission of Shenzhou XIII. Not only that, the three astronauts can be described as very successful, first of all, they are the first humans in the world to spend the Spring Festival in space. During their time in orbit, the three astronauts completed multiple missions and also conducted several scientific experiments.
Before the Shenzhou spacecraft landed, we were actually very worried, after all, the return of the spacecraft is a complicated and tense moment, whether it is for us, or for the unknown workers behind China's aerospace, this moment is a very nervous moment.
However, unexpectedly, the landing of the Shenzhou 13 spacecraft was very perfect, and even the staff of the National Space Administration also said: Unbelievable.
Being carried out
Now the three astronauts have returned. When we came out of the spacecraft, when we watched the CCTV live broadcast, you would find that the three astronauts were carried out of the spacecraft by the rescue team. Why, are they being carried out instead of coming out?
Astronaut selection
At this time, some keyboard men should say that their physical fitness is not good, yin and yang weird language. In fact, the mainland's requirements for selecting astronauts are very harsh, don't look at the three who are now being carried out, they have all piloted fighter jets before, and they have also undergone countless devil experiments.
In fact, the most direct cause happens to our bodies. As we all know, space is a gravitational vacuum environment, and gravity in space seems to have suddenly disappeared. When the speed of the spacecraft reaches the second cosmic speed, that is, the speed of circumnavigating the earth, you will find that the spacecraft suddenly loses gravity and many objects begin to float in the air.
Gravity environment
You know, we humans have roots on the earth, with a history of 3 million years, although it is not worth mentioning compared with the dinosaurs, but we have created a miracle of civilization that has never been seen before the earth. In the same way, our bodies have evolved in the time of evolution towards an environment that constantly adapts to the earth's gravity and gravity, so we are very adapted to the environment on earth.
But unlike in space, a gravity-free environment can cause many changes in the human body. First of all, when humans suddenly enter a gravity-free environment, the body will have many uncomfortable reactions. If an untrained person goes into space, the basic balance cannot be maintained, and it must be a dance of hands and feet.
Therefore, our astronauts, before entering space, will fully adapt to the gravity-free environment. In addition, because the three astronauts have been in space for half a year, the impact of gravity on the human body is very large, first of all, our bones have adapted to the action of gravity.
No gravity effects
The gravity-free environment will make human tissue unable to sense gravity, in this case, the components inside the bones will be lost in large quantities, so that the astronaut's bones become very fragile. Secondly, on Earth, all the blood in the human body is constantly circulating, but in space, the distribution of blood is very even, so this is why when we look at the three astronauts, we find that they have become fat!
In response to this problem, scientists have tried various ways, the most common of which is exercise. Rely on the equipment of the space station to exercise, so that the human body generates gravity, so as to better protect the health of the bones. However, over time, this effect will become more and more large, of course, it is not felt in space. But once on Earth, the result is different.
Return costs
During the process of the spacecraft's return, it will rub against the atmosphere and cause vibration, noise and a large amount of impact, which will make the astronauts inside the spacecraft experience unparalleled energy. The impact of this energy can easily make astronauts tired and exhausted. This is also why after the spacecraft landed, the rescue team immediately came to the rescue.
Doubt At this time, the astronaut's body is like a fragile baby. Not to mention letting them walk freely. That's why they were carried out. Second, the three astronauts returned to Earth after completing their mission.
This article summarizes
Rehabilitation, which lasts for weeks or even months, is designed to allow the astronaut's body to slowly adapt to gravity again. With the recovery of the body, the three astronauts were slowly able to walk, run and do some extreme sports freely.
Finally, let us congratulate the successful completion of this space mission, and also wish the three astronauts to recover their health and reunite with their families as soon as possible.