Why are astronauts a little younger after returning from space?

There is microgravity in space, cosmic rays and other conditions that are not available on the surface, so there are some changes in their physical function, causing them to look younger.

The theory of relativity can explain that the speed of movement in space is lengthened and slowed down.

But the difference is really small unless you compare two identical high-precision timers, such as a nuclear clock, one on Earth and the other with the astronaut in space, back on the ground.

It's not young, for example, you have a brother, you come back after 50 years in heaven and your appearance has not changed much, but your brother is already old, because in high-speed exercise, people's physiological changes will slow down.

Newton's theory of relativity explains that when a person moves at the speed of light, time slows down by a factor of 10,000, and when an astronaut flies, it's quite fast, and time slows down, so it's young.

As long as this astronaut returns, he will not be young.

He had to keep accelerating away from the Earth's frame of reference that he could deduce from the theory of relativity that we were a little faster in our time. But if he were to return to Earth, he would have to move faster than Earth, so that his time would be a little faster than ours, and in the end it would not change.

This involves knowledge of the theory of relativity, and it is impossible to explain it at all. You have to study physics to understand it.

It's not that he's young, it's that he's getting old.

The question of time and speed He was before and we were after time.

He was a little slower in time than we were.

In the theory of relativity, each observer has his or her own measure of time. This leads to the so-called twin paradox.

One of the twins is (x) who sets off on a space trip, he travels at nearly the speed of light, but his brother (y) stays on Earth.

Because of the speed of x, from the point of view of y on Earth, time passes more on the space shuttle. If you wait for X to come back, you will find that Y is older than him.

The classic conclusion of the theory of relativity. When people are moving at high speeds, there will be obvious relativistic effects, and low speeds will not be obvious. The basic overview of the theory of relativity is that the length of time dilation shrinks, and there are formulas that can calculate how much the length of the specific time dilation shrinks.

It's not that he's getting younger, it's just that he's getting older faster than the average person.

Nonsense, impossible, please don't believe this kind of news.

The Brothers Upstairs is Einstein's theory of relativity.

Of course, there is some truth to the latter explanation.

Astronauts are an enviable job where we can fly into space and see our Earth from a distance. But astronauts also pay a great price, they have to undergo very harsh physical training between going to space, and they also have to be familiar with a large number of complex operations, and they must have excellent psychological quality. After returning, their bodily functions have also undergone a series of changes.

First of all, staying in space for a long time can lead to osteoporosis, which is very deadly, and the human skeleton is constantly renewed, of which two types of cells are the most important: osteoblasts and osteoclasts. However, due to long-term life in space, osteogenic activity will decrease, which will lead to the loss of bone tissue and brittle bones, as if entering old age early.

Therefore, astronauts need regular exercise to slow down this process.

Then, like bone loss, because people are in the weightless environment of space, it will also cause people's muscles to lose the corresponding force, so the astronauts' muscles will atrophy. When these astronauts return to the ground, they will experience all kinds of fatigue, fatigue, and even inability to walk, so those humans who come back from space basically have a long recovery period.

As gravity decreases, the pressure provided by the heart decreases, blood pressure decreases, and the amount of blood transfused decreases, causing the left and right ventricles to shrink slightly.

Besides, when astronauts are out and about, they use kangaroo walking, and the famous cosmonaut Gagarin In space, you have to give up human walking and learn again"Walking"So when astronauts return to Earth, they walk like lame, which is why you see astronauts sitting on chairs when they first arrive on Earth, and they can't walk on their own.

The next half is about living things, the human spine is segmented, because of the gravitational pull of the earth, the human spine has a height ceiling, but there is no gravitational restraint in space, and then there is a section of the spine that can be increased, so it is temporarily increased, but after returning to the earth, it is completely restored to the original state.

The more obvious change is the formation of "space feet", because there is no gravity in space, the astronauts' feet will not be used basically, and every day when sleeping, astronauts will use their feet to hook the sleeping place in order to avoid floating around, and over time, the astronauts' feet will appear powerless, and hook the railing for a long time, there will be deformation, forming a "space foot".

The compressive force of the bone is significantly reduced, the muscles are degenerated to varying degrees, and the electrical activity of the bone tissue is significantly reduced due to the reduction of the external force borne by the bone, which will cause the aggregation of osteoclasts and lead to the destruction of normal bone tissue.

Bones and muscles will be in a state of tension and contraction, strongly compressing the blood vessels and lymphatic tissues, losing body balance, muscles will degenerate to varying degrees, and bone density will decrease.

Bone density is reduced, he will be a little younger than before he went to space, and it is possible that the muscles will degenerate to varying degrees as they grow taller The compressive force of the bones is significantly reduced Due to the space environment, the force of blood and body fluids on the surrounding supporting tissues changes from the downward to isotropic from the downward of the earth, which causes the upward backward flow of blood and body fluids and the flow of the surrounding areas, and the center of gravity of the body moves upward, which causes a series of problems such as the upper body becoming larger, the body shape becoming rounder, the head and face swelling, the intracranial pressure increasing, and varicose veins.

Astronauts can come back in the return capsule. Before the astronauts officially return, the crew on Earth needs to find a suitable place to land on the return capsule to return, and also keep an eye on the weather, and the astronauts in space need to check that the instruments on the spacecraft are functioning properly.

The angle of the re-entry capsule must be adjusted before entering the atmosphere, if the angle is too large, the spacecraft will return too fast and will be burned in the atmosphere like a meteor, if the angle is too small, the spacecraft will pass by the edge of the atmosphere and cannot return.

Most of the capsule land, sometimes the capsule will also land on the sea, the capsule will release dye into the water, dye the surrounding sea water fluorescent, and send out GPS positioning signals in time.

In order to avoid the high heat caused by severe friction with the atmosphere from burning through the bulkhead, the surface of the return capsule is coated with ablative materials, and the pyrolysis, melting, and evaporation of the materials are used to dissipate heat.

Theoretically, astronauts will be younger than the average person. Einstein's theory of relativity states that time passes differently at different velocities and in gravitational systems, and there is a time dilation effect. Specifically, in a high-speed system, the passage of time slows down; In a gravitational field system, the larger the gravitational field, the slower the flow rate.

This theory has been widely verified in space practice such as GPS positioning satellites. Now I will not go into the formulas of these two time dilation effects, but only the results. According to these two formulas, astronauts move at speed on the International Space Station, and the passage of time slows down every day; International space, on the other hand, is moving at an altitude of about 400 km, where gravity is smaller than that of the Earth, so the passage of time is speeding up, every day.

Space sickness. Since space is weightless, the human body that adapts to the gravity of the earth will undergo various changes, such as the internal organs are floating up and will not be in place; Body fluids will flow in all directions and feel lightheaded; muscle relaxation and so on. In this way, space syndrome will appear, such as dizziness, paleness, nausea and vomiting, increased saliva, headache and drowsiness, constant belching and farting, etc., and there will be an adaptation period, during which severe cases are likely to lead to danger.

After astronauts return from space, the compression of the bones will be significantly reduced, and the muscles will also have some degeneration, and the density of the bones will also decrease. I believe that everyone should have a dream of being an astronaut when they are young, but it is very difficult to become an astronaut, both physically and psychologically. Therefore, every astronaut is very respectable, because after they live in space for a long time and then return to Earth, there will definitely be some changes in their bodies, which will affect their normal life.

The environment in space is different from that of the Earth, whether it is air pressure, air temperature or gravity, it is very different from that on Earth, and in space, astronauts also have to face very strong radiation. Because there is no gravity of the earth in space, there is no way to support the astronauts' bodies, so their movement will be limited to a certain extent. And there will be very strong radiation in space, even if the astronauts wear very heavy spacesuits, there is no way to completely isolate them.

Because there is no gravity of the earth in space, the compression of the bones of the body will be significantly reduced, and the height of the astronauts will become taller, but after returning to the normal life of the earth for a period of time, the density of the bones will return. Because there is gravity on the earth, the muscles will be in a sinking state, and people will have to overcome the gravitational pull of the earth all the time if they want to exercise normally. But in space, because there is no gravity and gravity, human muscles are also in a relaxed state.

If you stay in space for a long time, it is easy to cause muscle atrophy. Therefore, these astronauts will also be equipped with fitness equipment in space, and if they do not carry out continuous training, it is easy to cause muscle degeneration. Moreover, it is easy to cause a series of cardiovascular problems in space, because there is no tissue ability for the body's blood in space, so the blood will flow to the surrounding of the body, and the center of gravity of the body will also be upward, which can easily cause problems such as varicose veins and facial swelling.

There will be severe swelling in the body, muscle atrophy will reach level 4, and then it will be difficult to lift the legs, and the pressure on the bones will become less and less, but in 20 days, it is possible to grow 5 cm taller, and many people will need to lift it out when leaving the cabin.

Your body may be weightless, after all, you may not be able to adapt to the gravity for a while, or you may not be able to operate your own behavior or walk normally, and you can return to normal after a period of relief.

The compressive force of the bones is significantly reduced, the muscles do not degenerate to varying degrees, the bone density decreases, the DNA inside is likely to mutate, and the weight and height will change.

The astronauts who came back from space were still themselves. An astronaut, or astronaut, or astronaut, is a person who has made a career out of space flight or has flown in space. The criteria for determining the flight of too much airslide are not fully harmonized.

In the United States, people who travel more than 80 kilometers (50 miles) above sea level are called astronauts.

Pick

Aerospace activities are a special kind of professional activities, which have the characteristics of special working environment, highly complex vocational skills, and arduous flight tasks. Such a profession requires astronauts not only to have a healthy physique and good mental quality, but also to have a high degree of tolerance and stress resistance to the space environment, and at the same time should have profound knowledge and superb skills.

Therefore, all space departments in the world have carefully selected astronauts.