Astronauts returned from outer space, and a large number of rescue teams found the return cabin and cheered when they opened the hatch. Then get the astronauts out of the return capsule, and then do a simple interview, take a group photo and record this historical moment.
After the simple process is completed, the medical team will immediately conduct a physical examination on the astronauts to ensure that they are not injured when landing.
However, it was found that the astronauts would not take off their spacesuits immediately after coming out of the return capsule, and they were all taken away, even their seats. Why?
In fact, this is related to the environment experienced by astronauts in space. After returning to the earth from space, the body has not adapted to the earth in many aspects. Let's take a look at what happened to astronauts when they were in outer space, which made them unable to adapt to the earth's environment immediately:
As we all know, astronauts are in weightlessness on the space station. Because astronauts will not only stay in the space station for a day or two, long-term weightlessness will make some changes to their bodies.
First of all, the height of astronauts will change obviously, and the president will be 3% taller! In the microgravity environment of the space station, the spine will not be squeezed, the ligaments and tendons around the intervertebral disc and spine will be relaxed, and the height will automatically increase.
Secondly, astronauts will have problems with their blood circulation. On earth, blood circulation is affected by gravity, but when we arrive at the space station, the blood pressure of human body will be lowered to implement microgravity environment. At the same time, astronauts' blood will be reduced by 20%, which is an unchangeable fact and can only be overcome by astronauts' own exercise.
When astronauts return to the earth, the gravity will change greatly in a short time from the space station to the ground.
Then when the astronauts land, the relaxed spine and bones will bear the gravity of the earth. This sudden increase in gravity will make astronauts feel very heavy and uncomfortable.
In addition, gravity suddenly increased, but the blood pressure of astronauts has not returned to normal, and blood has not been replenished quickly. If the astronauts stand up at this time, they will feel dizzy, have a headache and even faint in severe cases.
Therefore, in the last few hours before returning to Earth, astronauts will eat a few pieces of salt and add about 2 liters of liquid. The specific amount of drinking water is adjusted according to the weight of astronauts. This is done to increase blood volume and blood pressure, which can effectively alleviate the discomfort of astronauts after landing in the return capsule.
Besides, the astronauts have just returned to Earth. When the brain receives the signal of increasing gravity, it will command all organs and tissues of the body to adapt to the new gravity environment. During the adjustment, the astronauts were very weak.
Therefore, the astronauts returned to the earth from the space station and experienced rapid changes from microgravity to the gravity of the earth, and their bodies could not adapt for a while. Standing and walking directly will cause some physical problems, so carrying it is the most suitable.
It is a very dangerous and arduous process for astronauts to return to earth from the space station. In the process of the return capsule returning to Earth, astronauts are under great psychological and physiological pressure and consume great physical strength.
Astronauts will receive return training on earth before going to the space station. They should keep in mind the operation process of returning, learn various ways to deal with emergencies, and once they encounter difficulties, they can use their subconscious mind to make correct operations. Even so, astronauts still face great challenges when they return to earth.
The most dangerous time for astronauts is when the return capsule opens its parachute and lands. When the parachute opens, the return capsule will rotate violently and sway. This process will last about 20 seconds, which is a great challenge to the astronauts' physical quality.
When the return capsule lands, the astronauts will face a strong impact, which is completely different from the pilot skydiving. Landing in the return capsule is like a small car accident, which is one of the most vulnerable processes for astronauts.
In order to minimize the injury to astronauts, astronaut seats are generally specially designed and customized according to the physical condition and body shape of astronauts.
In addition, after the return capsule landed, the rescue team could not find the landing site immediately, and the astronauts sometimes had to wait for several hours, which was also a kind of consumption for the astronauts' health.
Therefore, in the whole process of returning to Earth, astronauts experienced weightlessness, overweight, violent shaking, rotation, impact and waiting. At this time, the astronauts are exhausted, and it is also appropriate to carry them after leaving the cabin.
When astronauts return from space, in addition to the above two challenges, their bodies will also undergo some changes:
1, muscle degeneration
Being in weightlessness for a long time, astronauts' skeletal muscles no longer need to be stretched continuously, but will automatically contract. In other words, astronauts' muscle tissue will weaken. Generally, in the space of 5 1 1 day, astronauts' muscles will contract by 20%.
2. Bone loss
Astronauts who work in the space station for a long time may suffer from osteoporosis, and weightlessness will cause astronauts to lose 1.5% of bone tissue every month. The lost bone minerals will be absorbed by the body, leading to an increase in blood calcium concentration and even kidney calculi. Astronauts are more likely to break bones when they return to the ground.
3, neck and back pain
In the first few weeks of entering the space station, astronauts' necks and backs will be very painful, which is caused by physical changes caused by weightlessness. When they return to earth, these symptoms may be forgotten. According to statistics, in the first year of returning to Earth, astronauts who have been performing space missions for a long time are four times more likely to suffer from disc herniation than normal people.
In a word, astronauts will have some physical changes after working in space for a long time, and they will have to bear greater physical challenges than ordinary people after returning to earth.
When you see the astronauts being carried away by the rescue team, don't think they are playing big cards.
Astronauts landed from space, experienced great challenges and suffered great physical pain. They are real space heroes!
Isn't it right to take them away?
Astronauts must carry it back when they come back, and female astronauts are not allowed to get pregnant in the short term!
You think they enjoy the highest treatment, but they are not. If they walk suddenly, it may have serious consequences. Astronauts who have just returned to earth are as fragile as children and certainly need special care!
Then they will be taken away. Why on earth? Can't astronauts go to space, or is the spacesuit too heavy to walk?
In fact, when landing, the spacesuit will not be taken off, and the staff will carry it with them. In fact, this is a very necessary operation step. Let's find out.
Astronauts risked their lives to explore the mysteries of the universe in outer space. Because space is a vacuum and there is no gravity, it needs strict training before taking off. After all, not everyone can fly into space and feel the different beauty of the earth.
Astronauts must first carry out long-term weightlessness training and knowledge storage on the earth. After completing the space mission, they need to return to Earth in a return capsule. However, after returning to earth, they all need help, or carry them, or even need wheelchairs to push them.
This is the difference between space and the earth. As we all know, space belongs to a vacuum environment, which is beyond the gravity of the earth. We often see astronauts floating freely in the cabin. They don't need to walk on their legs at all. If you stay in space for a long time, your body has adapted to the microgravity environment, and your muscles have not been exercised for a long time, which may cause muscle atrophy and decrease your endurance.
When returning to Earth, the astronauts were very nervous physically and mentally.
After returning to the earth, it is difficult to adapt to the gravity of the earth. It's like you've been on a rickety boat for a long time, and you feel unstable when you get back to the ground. Moreover, the distant space environment is completely opposite to the earth. At this time, it will take astronauts some time to readjust to the gravity of the earth.
If you leave just after landing, it is likely to cause injury and fracture to your body. If astronauts stay in space for a long time, the stress on bones will be much reduced. In the absence of gravity, calcium in bones will be decomposed and released into the blood at a faster rate, which will lead to a long-term decline in bone density.
Some astronauts who stay in the space station for about ten months will definitely have some influence on their health, because the bone density will decrease by 1% in about one month, so the astronauts' bones are easily damaged. When they return to the ground, they can't walk immediately, otherwise there will be a risk of fracture, which is an important reason for being carried away.
When astronauts return to earth, they may feel dizzy. Their bones have been damaged, and they are unable to walk because of dizziness. If they fall down carelessly, their bones will be badly hit. You know how difficult it is to train an astronaut.
Therefore, carrying them is an effective protective measure. Staying in space for a long time will also lead to a decline in body temperature endurance, and there are many difficulties to face. Eating and sleeping are small things, but they are difficult in space. They are like fish floating in the water. Without support points, astronauts will do some harm to their bodies when they come back, such as bone loss and muscle atrophy just mentioned.
So when they come back, they need systematic and professional rehabilitation training besides their backs. This recovery period is usually divided into three stages, namely, isolation period, recovery period and recovery period, which takes about 4 months to complete.
Even so, some injuries cannot be recovered. Since it is easy to fracture, why should it be isolated? In fact, there are cosmic rays in space, and some rays can't even be isolated from spacesuits, so it needs to be isolated for about two weeks, and then two months of rehabilitation training, and then you can enter the recovery period. Professionals will do their best to restore the body to its original state.
Why can't female astronauts get pregnant in the short term? In fact, this is for the sake of children's health, because the space environment is complex and there are a lot of radiation and rays, which will cause certain harm to the health of astronauts. It may not be visible for a short time, but the gene may be damaged to some extent. If you are pregnant at this time, the child born may be unhealthy.
Therefore, we can see how admirable astronauts are. This is a feat in human history. How great it is to shoulder the sustenance of all mankind, bear the physical wear and tear, and go to outer space to explore without hesitation, bringing us unprecedented knowledge!
Your weight 160 kg is almost equal to 10 kg and 20 kg in space. When you get used to it, go back to earth and feel 320. Can you still walk? In addition, the return is not less than the overload in the rising process. Astronauts have to bear eight overloads in training, while roller coasters are said to have only two overloads. You took a roller coaster that accelerated more than four times. After stopping, can you still walk on your own? Astronauts are the real hard work! To borrow an online buzzword, have you ever worked hard for others in your life?
Muscle atrophy, heart atrophy, osteoporosis, enlarged head, aching all over, and violent impact when landing, it is difficult to stand up. Do you still expect them to walk by themselves?
Hundreds of astronauts around the world travel in space. They came from all over the world, received different training and completed different tasks, but they had one thing in common: they were carried away after landing.
Some astronauts are in danger, not only to carry them back, but also to give first aid immediately. Looking around the world, no astronauts jumped and cheered after a successful landing. Although they are very excited inside, everyone dares to make fun of their health. If they are not good, they will ruin their lives and never return to space.
The reason why this happens is that the environment in space is particularly complex, not as simple as weightlessness, but weightlessness alone is enough to pose a great threat to the health of astronauts. Do you think it is interesting for astronauts to fly around in space? In fact, danger lurks around them.
Muscle atrophy, heart atrophy Under the influence of microgravity in space, astronauts can't feel their own weight at all. They are like a cloud all the time. They can fly to another place with the flick of their fingers. This looks fun and easy, but there are huge hidden dangers.
There is no problem at all in a short time, but over time, the astronauts' muscles will slowly shrink and float in the air all day, and they will disappear naturally. It's like a patient who has been ill in bed for a long time. If someone takes care of him to eat and drink, his whole body muscles will disappear, especially his leg muscles, and he will have no strength at all. Even after he recovered, he couldn't stand up at all. That's the reason.
Among many muscles, our earliest muscle is leg muscle, or arm muscle. In fact, the heart itself is also a big muscle. Under the influence of microgravity in space, the heart will also contract and deform, and its own function will also be affected. Although it will not stop beating, arrhythmia will inevitably appear, and the incidence of various heart diseases will be greatly improved. After landing on the earth, I want to jump up and celebrate, which is undoubtedly an increase in the burden on my heart.
The effect of osteoporosis in space microgravity is not only to relax muscles, but also to relax all bones. For example, the bones in the legs always support the weight of the whole body, such as the spine, and usually support the weight of the upper body. After the sudden loss of gravity, these bones will be idle and completely relaxed, and the spine that was originally bent by weight will also be stretched. To put it bluntly, it will grow taller. Can Luo suddenly straighten up?
After complete relaxation, under the influence of microgravity in space, all bones will become osteoporosis, and the bones will become soft and no longer hard. There are many such situations around us, for example, the elderly, such as children, have a certain degree of osteoporosis. Casual falls can lead to fractures, and so can astronauts.
There are many people with osteoporosis on the earth, but they have adapted to the blessing of gravity, know their weight and range of activities, and will not exercise too vigorously to ensure that nothing will happen. But astronauts are different. They stay in space all the time, can't feel the gravity of the earth, and don't know where their limits are, especially when they just landed. They are not used to this weight, and they may have broken their bones as soon as they stood up.
Blood pressure is unstable, and astronauts' blood pressure will also be affected when they just land on the earth. Blood pressure is very unstable, and hypotension often occurs. Sudden standing can lead to headache and even direct syncope.
This is also influenced by space microgravity. In space, there is no weight limit for blood, and the heart can easily supply blood. You can put a small water pump in your heart, and blood vessels are water pipes. When on earth, the capacity of this small pump is limited, and it can only supply water to the second floor. There is no way to go any higher, because water is heavy and gravity is too strong, but in space, the weight disappears.
Because of this, the heart has become accustomed to the relaxed way of working in space, and suddenly there is pressure. Also very helpless, it is likely to go on strike directly. Imagine a car that is used to going downhill. If you suddenly let it climb the hill, it will really stall you.
When the top of the earth is relatively large, it is easier for the heart to supply blood to the lower limbs than to the upper limbs. This is the role of gravity. As long as you stand upside down, you can obviously feel more blood on your head. My face will turn red and I will feel dizzy after a long time. This is gravity.
As I said just now, the heart works in space and it is easy to supply blood to the head. At this time, it is equivalent to standing upside down all the time, and the blood pressure on the head will rise. After a long time, the head will become bigger and the neck will become thicker because of congestion. The amount of blood in the body is certain. After the blood in the upper limbs becomes more, the lower limbs will naturally become less. At this time, the legs will become slender, coupled with muscle atrophy, and sooner or later they will become thick bird legs in the upper body.
This situation can be described in one word. It is top-heavy, like a cone, and it can't stand steadily at all, let alone walk.
The violent impact of landing Yang Liwei was the first heroic astronaut in China to go into space, but when he landed on the earth, something unexpected happened.
At that time, Yang Liwei's return capsule was an oval metal ball, which was directly loaded into the atmosphere like an extraterrestrial meteorite. When it rubs against the atmosphere, it generates a lot of heat, and the temperature reaches about 1700 degrees. Seen from a distance, this is obviously a fireball.
In this process, the return capsule has been in a state of severe jitter. Yang Liwei always felt shaking in the return cabin. He knows this process won't take long and he will be able to go home soon. But at this moment, a crack suddenly appeared in the glass of the right porthole. You know, it is 1700 degrees outside. If the porthole is completely cracked, the consequences can be imagined. Fortunately, the problem that everyone was worried about did not appear.
The return capsule itself is a metal ball. Instead of stopping directly after landing, it bounced high and landed for the second time. This process made Yang Liwei suffer a violent impact inside, and the microphone even scratched a wound on his lower lip. Although it's just a skin injury, it looks really serious. In order to avoid unnecessary trouble, on-site rescuers helped him deal with the wound first.
Although the wound on the mouth is small, the violent impact and fear of death still let Yang Liwei reach the limit. With the help of rescuers, he barely stood up. In this case, are you willing to let him walk back by himself?
Shenzhou XII: No matter from which point of view, astronauts' entry into space has a great impact on their bodies, but they are still wave after wave. In order to help mankind open the door of the universe and make mankind more prepared for the unknown in the future, they are the real heroes for the better development of mankind!
Both physically and morally, they deserve to be carried away!
Today, three heroic astronauts of Shenzhou XII are working in China Space Station. They are our heroes. I hope everything goes well and come back safely!
Astronauts are in weightlessness in space. After a long time of weightlessness flight, when the astronauts return to the ground and land normally, even if they are in good health, because their bodies have adapted to the microgravity environment, coupled with radiation and low pressure from space, they may cause discomfort to the human body, and their straight endurance may decline, and muscle atrophy may occur. Moreover, when the astronauts return to the atmosphere, they are in a state of high pressure and tension physically, mentally and psychologically. After returning to earth, they can't leave the cabin independently.
I don't know. It means that it is very difficult to walk on the earth from weightlessness in space, just like when you go swimming, it is very heavy to come out of the water.
Is it like swimming, just coming out of the water, feeling particularly heavy? Of course, astronauts are more serious than this.
I went swimming for the first time and came out of the pool an hour later. I just can't get up by the pool and feel helpless. I'm used to it. Not anymore. How serious it is to come back from space and want to try.
Human beings have a long history of exploring the universe, from ancient the Goddess Chang'e flying to the moon to today's spacecraft, from the first astronomical telescope in17th century to the first artificial satellite in 1957. From 196 1 years ago, the former Soviet astronaut Gagarin became the first astronaut to step into space. Up to now, more than 400 astronauts have stepped into space.
China's first astronaut was Yang Liwei. In 2003, with the successful launch of Shenzhou 5 spacecraft, China astronauts took the first step in space, followed by the perfect performance of Shenzhou series spacecraft. Up to now, China has 15 people in space, and the space station in China is also in progress in an orderly manner, which is a great milestone in China's space industry.
However, behind this great progress is the hard training of astronauts for ten years. From the selection and training of astronauts to space travel, every step is carried out with the highest standards. As ordinary people, we see that astronauts are mostly successful. Here, everyone has a question. Why did the astronauts not come out immediately when they landed on the earth in the return capsule from space, but were carried out by the staff after a while? Why on earth is this?
In fact, it is not difficult to understand from another angle. It's like when we are suspended in the swimming pool for a long time and suddenly go ashore, we will feel heavy, as if there is a mysterious force pressing our bodies; So do astronauts. After they return to Earth from the weightless space environment, they can't adapt to this environment immediately under the gravity of the earth, which means that their bodies will change greatly after astronauts fly into space.
After the astronauts enter the predetermined orbit by spaceship, the flight speed is close to 7.9 km/s, and the centripetal force counteracts gravity, so the spaceship cabin is in weightlessness, that is, there is no gravity, and the thrown objects no longer do parabolic motion, so the astronauts can't stand still by gravity, and everything in the cabin is in suspension.
In the weightless environment, the body of our astronauts has also undergone obvious changes. The vestibular system and nervous system of the brain are disturbed, and they can't tell the front, back, left, right, east, west, north and south. Astronauts can swim and stand upside down at will, and at this time there will be a reaction similar to seasickness and vomiting. Even if astronauts usually have simulated training, weightlessness syndrome will appear after coming to space, and it will take some time to adapt.
When astronauts adapt to the weightless environment in space, their body systems continue to learn the viability of space, and everything can work normally. However, when they returned to Earth in the return capsule, they returned from weightlessness to gravity in just half an hour. Their brains haven't had time to react and their body mechanisms haven't been adjusted. Spatial orientation and gravity are a big problem for them. At this time, it is difficult for astronauts to stand and walk, and the vestibular system of their brains can't control their bodies.
Under weightlessness and low pressure, the human body begins to expand, the compressive force of human bones is obviously weakened, the bone tissue is no longer in a tight connection state, and the gap between the spines is stretched in the direction, so that the height of people in space will be 3.5 cm higher than that on the earth.
Similarly, the muscle tissue is very loose in weightlessness environment, and the muscle also degenerates to varying degrees. On the earth, in order to overcome the gravity of the earth, the muscles of the human body will stretch and contract to varying degrees, so that the muscles can be exercised. After reaching space, muscle tissue does not need to get rid of its own weight, and muscles begin to contract. The longer it is in space, the more serious it will be, which is one reason why astronauts should exercise frequently in space.
When the astronauts returned to the earth, the atrophied muscle tissue could not support their bodies at all, so they had to lie down and wait for the workers to help.
In the weightless environment, the stress of human bones is reduced, the activity of bone tissue is weakened, the minerals in bones are dispersed, and calcium ions are easily lost, which leads to electrolyte disorder, osteoporosis and decreased bone density. After returning to the earth, standing up under the gravity of the earth can easily lead to fractures.
In addition, in the space environment, human blood and water are no longer concentrated under the feet, but scattered around the body, and the center of gravity of the body moves up. In this case, the circulatory system in the body has changed, and the pressure in the skull of people has increased, which is easy to cause cardiovascular diseases, the intraocular pressure has increased significantly, the vision has been damaged, and the taste and smell systems of people have been greatly disturbed.
If you return to Earth in a short time, the astronauts' circulatory system will not respond, their body functions will not be adjusted normally, and their body fluids will not be reset, so the astronauts will have to lie down and let the staff do it.
From launch to return, astronauts have great ups and downs. First, they shoulder great responsibilities, their every move is in the eyes of the whole country, and they guarantee the completion of the task; Second, life is always in danger, especially in the stage of launching and returning to earth. If there is an accident, life will be in danger. Astronauts return to the earth, one is physically uncomfortable, and the other is psychologically uncomfortable. If the body fluctuates slightly, their blood will flow faster, which will also cause their mood to fluctuate, so they have to lie quietly.
Astronaut is our childhood dream and a sacred profession, but it is not so easy to become a qualified astronaut. The selection and training of astronauts are very demanding and temper our will. To be a qualified astronaut, we must receive intensive training:
First, a solid knowledge theory
To know astronomy above and geography below, astronauts must have basic physics, aerodynamics, aerospace medicine, physiology and so on. It can be said that astronauts are a living textbook.
Second, a strong body
Only a healthy and strong body can adapt to the living environment in space, especially the endurance and cardiopulmonary function of astronauts must be strong.
Third, overweight and weightlessness training
Rockets have a great sense of overweight and weightlessness when taking off, returning and flying in orbit, so they must pass.
Fourthly, simulated flight training.
Astronauts must simulate space flight training in a low vacuum simulator before going into the sky, and all indicators must be qualified.
Five, psychological quality training
As a qualified astronaut, you must have a strong psychological quality, be able to calmly cope at critical moments and tide over difficulties.
Sixth, super adaptability.
The space environment in the universe is complex, rockets will produce noise when flying and landing, and there are too many syndromes in space flight, so astronauts must have strong adaptability.
Seven, personal self-help ability
Self-rescue ability is a basic skill that a qualified astronaut must have, and he can get rid of risks and complete self-rescue in dangerous times.
Astronauts astronauts need staff to carry them when they return to earth, mainly because the change of environment makes their body and mind unable to adapt at once, and it takes time to adapt to the transition again.
Therefore, astronauts should undergo professional recovery and adjustment after returning to Earth. This process takes about four months, mainly divided into isolation period, recovery period and recovery period. After a four-month recovery period, astronauts can re-adapt to this earth environment.