All content in this article is based on official and reliable sources, and the specific information is detailed at the end of the article
Preface
With a dazzling "meteor" in the sky city, at 5:47, our Shenzhou-17 astronauts finally returned to their home on Earth.
When the return capsule was opened, we could see that the three astronauts were in good condition, which relieved our suspense, and at the same time, it also announced another complete success of China's space mission.
But in the process of returning to this voyage, Shen XVII showed us a major highlight.
Shenxvii evacuated the space station this morning and landed successfully in the afternoon, in just a few hours.
This can't help but make people feel that the distance between the earth and space seems to be one step closer, so how did God XVII do it?
Prepare to welcome the astronauts home
Before the return of Shen XVII, the ground staff had already begun intense preparations, and in order to ensure that the astronauts could reach the ground smoothly, we also made full preparations.
At the Dongfeng landing site, five helicopters were assembled early, two of which were also equipped with professional medical rescue equipment to ensure the safety of astronauts.
At five o'clock, Shen XII entered the inertial gliding stage and officially began the journey home.
At the same time, the three astronauts of Shen XVIII were also watching the live broadcast, and they also waved to the audience in front of the TV.
In the return screen, we see that the return capsule is very crowded, and according to the introduction, it contains a large number of materials, many of which are experiments done in space, and will be sent to a special place for preservation and research after landing.
Shortly after entering the inertial taxiing phase, we lost the view of the exterior of the re-entry module, which was not an accident on the part of the re-entry module, but a separation of the propulsion module and the re-entry module.
And some of the equipment that transmits the picture is installed on the propulsion module.
After the separation of the two cabins, the return capsule will slide down by inertia, and during this time, it will also produce a high temperature of one or two thousand degrees Celsius due to air friction.
But don't worry, there is a special coating on the outside of the capsule that will burn and detach from the capsule to ensure that the temperature inside the capsule does not change drastically.
After a period of flight, the re-entry capsule also walked out of the black barrier and opened the parachute at an altitude of 10 kilometers to complete the final stage of landing.
Finally, the re-entry capsule landed on the ground at a speed of 2 meters per second.
After the return capsule landed, the ground staff quickly stepped forward and picked up the astronauts.
It can be seen that after leaving the capsule, the astronauts did not stand and walk directly, but sat on chairs.
This is because during the six-month journey to space, astronauts have long been accustomed to weightlessness, and after entering the atmosphere, gravity is getting bigger and bigger, which still has a great impact on astronauts, so it also takes a certain amount of time to adapt.
The successful return of the three astronauts is another great success for the mainland's aerospace development.
At the same time, there is also a curious question, you must know that Shen XII returned to Earth at that time, but it took more than 28 hours, and for such a long time, the astronauts need to stay in the return capsule, which is a huge test for the astronauts' physical and psychological skills.
And in the launch mission after launch, the continent's return technology is also constantly developing and improving.
Now, it only takes 7.5 hours for God XVII to return from space to Earth, so how does it do it?
God XVII quickly returns to the technique
When the Shenzhou spacecraft returns to the earth after completing its mission, it does not fly directly vertically to the earth and enter the atmosphere, but requires a strict and precise launch time, just like when launching a rocket.
After the spacecraft is launched, the speed is very fast, much faster than the rotation speed of the earth, and it only takes an hour and a half for Shen XVII to circle the earth.
Therefore, at this time, Shen XVII must first circle around the earth, and after reaching the appropriate speed, the spacecraft still cannot enter the atmosphere at will, but must accurately grasp the time and space points, otherwise it may land at any point on the earth, so the risk is too great.
Generally speaking, the spacecraft will only choose to enter the atmosphere and land when the orbit has just passed the landing site.
So how long does it take from getting out of orbit around the earth to successfully landing at the landing site, about an hour and a half.
It can be seen that the length of time for the Shenzhou spacecraft to return mainly depends on the length of time it takes to orbit the earth.
At that time, Shen XII flew around the earth more than ten times and began to land after 27 hours, but this time, Shen XVII only needed to circle the earth 5 times before entering the atmosphere.
Such a rapid return technology is extremely important for astronauts, because during the return process, astronauts need to wear heavy spacesuits in the north field.
And we can also see from the return screen that the space of the return capsule is very small, and the astronaut needs to be fixed to the seat, so it can be said that except for the arms, other parts are inactive.
In this case, astronauts must be under tremendous pressure even if they are physically fit, and now that time is greatly reduced, it also means that astronauts are under less pressure.
文 | ZYG
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