According to the latest news, the three-person crew of the Shenzhou 14th astronaut has successfully evacuated the space station assembly and entered the countdown to go home. The Dongfeng Landing Field on the ground has also completed three comprehensive drills for the entire system. The official news has made it clear that there are only single digits left before the "return" of the God-14 astronaut crew. So, what are the hidden risks and challenges of returning to the earth that netizens are worried about? What changes will happen to the astronauts' bodies after returning to Earth? Let’s take a look at it in detail below.
minus 26℃, 8 pm, the most difficult in history: Shenzhou 14 returned at night for the first time after 17 years!
It is worth noting that not only the astronauts have made more than one first breakthrough, but also the same is true for the manned spacecraft . Some news previously said that this was the first time I returned at night, but in fact, I ignored the qualifier , which is 17 years later! In fact, this is not the first time in history. As early as 17 years ago, the Shenzhou VI in 2005 took a night landing. So, how is this different from 17 years ago? Why choose night rather than daytime?
Shenzhou VI Flight Crew
First of all, netizens are very concerned about it. It is indeed not the first time this time is landing at night. But what is certain is that this is indeed the most difficult first time in history. Compared with the landing of the Shenzhou 6 return capsule 17 years ago, although it was dark at that time, the exact time was 5:38 am on October 17. Judging from God Fourteen this time, the official estimate time is 19:52-20:22 on December 4. According to previous estimates, it is likely that it will be in the middle.
Secondly, from the landing point, there are also big differences between the two. Shenliu is to return to the main landing ground of the Siziwang Banner of Inner Mongolia, while Shenliu Fourteen is to choose its backup Dongfeng landing ground. Both are located in Inner Mongolia, but the former is mainly grassland, while the latter is mainly desert and Gobi. However, because 20,000 square kilometers is not only ten times larger than the former, but the terrain and vegetation are more complex and the natural environment is harsh. At the same time, the Dongfeng Landing Site also has no network signals, and everything depends on human search.
Search and rescue team members practiced and set up the sanitary communication
Furthermore, in recent times, due to the super cold air mass attack in the country, our country ushered in the strongest cold wave since this winter. Inner Mongolia is a purple air-cooled air mass, and according to search and rescue personnel, it may encounter an extremely low temperature of minus 26℃ when it officially lands at night. Together, these three things obviously have a huge impact on the implementation of a series of emergency rescue measures after dawn in summer and autumn than on winter nights.
Then this will come back to the point that netizens are very puzzled. Why do you have to choose night instead of day? You can’t wait a little earlier or postpone it a little later, and wait until the day before returning to the earth? Obviously, like experts, Rubik's Cube does not agree with this statement!
Whether it is for testing night return, improving the full-time return technology, or for the long-term development of our country, it is unwise to directly choose daytime.
and as netizens yearn for, the sea landing method adopted by the return capsule of in the United States has not been tested due to the relatively small sea area and the large number of reefs in the sea area. However, there will definitely be attempts to return multiple terrain in the future. From this point of view, it is not a way to make progress by sticking to the daytime return.
Furthermore, from the actual situation.The earth has its own rotation pattern. If you miss a point in time, it means you have to wait for a long time. When returning, you also need to combine the actual situation of the earth. The colder the later you go. For the safe and accurate landing of the return capsule and the safe "returning home" of astronauts will only cause greater challenges for no reason.
How difficult is it to "go home" in the Shenzhou No. 14 three-person group? How to break through the three major levels?
It is worth mentioning that in addition to the above-mentioned breakthrough of the landing difficulty of the return capsule, the Shenzhou 14 three-person crew has to break through the history of the landing difficulty of the return capsule, and to complete this task safely and perfectly, it is also necessary to break through three major levels!
When the astronaut crew was about to return, experts said that they will carry three tools with them this time: dagger, red potion, and pistol. In fact, this is when they return to land, when the return capsule falls into the water and floats, scattering it on the water can allow the search and rescue team members to find them faster; daggers and pistols can be used to defend against wild beasts, and firing a gun can also give search and rescue team members the prompts to minimize the time they are exposed to the wild.
In addition, the manned spacecraft they were riding back to Earth was not smooth sailing. At the beginning, the spacecraft needs to circle the earth a few more times and then determine the best time to return. This step determines the deviation between its landing point and the predicted point.
. In this process, God 14 and God 13 will use the fast return technology, which takes about 9 hours in total, which is a full 19 hours shorter than the 28 hours of Shenzhou 12 . While returning quickly, its speed will also reach the first cosmic speed of . At high speed and high temperatures, the spacecraft will enter the " black barrier zone" where communication is interrupted for a period of time. After the return capsule of
and other things drop to a certain level, the spacecraft will open the parachute. When the speed drops to 90 meters/second, the main parachute will be opened until the speed drops to 7-8 meters/second, and then drops to 2 meters/second under the thrust of reverse thrust engine to ensure that the damage to the astronauts' bodies is minimized. There is no doubt that during this whole process, both the main umbrella and the reverse thrust engine require the cooperation of astronauts.
Finally, the bodies of the God Fourteenth crew members will also undergo drastic changes after returning to Earth, which is also the third biggest level they need to overcome. Anyone who has watched the real-time search of the return capsule knows that astronauts will carry them in chairs when they come out and will not say a few words when they speak. In fact, this is not their coldness!
But because they live in weightless for a long time, their bones are prone to loosening, and the impact of gravity comes to their faces after returning to the earth. They don’t say much because the body needs time to adjust, and they also need to go to the medical car to replenish energy in time. Professional medical staff will conduct further examinations and care, and there will even be months of rehabilitation plans in the later stage. This is also the reason why the meeting after returning is generally postponed. The Thirteenth Crew Team of God Thirteen was postponed for 74 days.
Shenzhou 14th crew landing countdown! Shenzhou 16, 17, and 18 are ready to be in place
Indeed, it is not long before the expected official time, only a few hours left. The official has already announced that you can watch live broadcasts through multiple channels by then. As another new attempt, it is worth looking forward to by each of us.
However, what makes the Rubik's Cube even more exciting is that in addition to the orderly completion of the handover of Shenzhou 15, the construction of the space station has also been carried out on the orderly basis of Shenzhou 16: the final assembly test has been completed, and the final assembly test of Shenzhou 17 and Shenzhou 18 manned spacecraft is also in progress simultaneously. I have to say that this confirms the continuous aerospace spirit. I also look forward to more good news from China's aerospace industry, and the Rubik's Cube will continue to pay attention.
