Astronaut's life in space： secrets and thrills you don't know

　　What would you do if you were an astronaut and accidentally fell into the endless darkness while performing a task in space? Is there any way you can get back to the ship or wait for help?

　　Astronauts will not easily fall into space when they are out of space. Because they all wear special spacesuits, which can not only protect them from the damage of space environment, but also have a small life support system that can provide oxygen and temperature regulation. Moreover, astronauts will tie themselves to the spacecraft with a safety rope to prevent them from drifting away. Therefore, unless there is an extreme accident, such as a broken safety rope or an explosion of the spacecraft, astronauts will not lose contact with the spacecraft.

　　However, if this happens, is there any hope for astronauts to return to the spacecraft? The answer is: maybe, maybe not. It depends on how far the astronauts are from the spaceship and what tools they have. Let's look at two possible methods.

　　The first method is to use Newton's third law.

　　Action and reaction are always equal, opposite and collinear. This means that if an astronaut exerts a force in one direction, he will get a force in the opposite direction, thus changing his state of motion. Therefore, if an astronaut has some items in his hand, such as tools, parts, bottles, etc., he can throw them in the opposite direction of the spacecraft, thus generating a reverse thrust and letting himself approach the spacecraft. Of course, this method requires some skill and luck, because there is no resistance and gravity in space, and the object will always move along the initial speed and direction. If you throw it inaccurately or untimely, you may miss the spaceship or collide with it.

　　The second method is to use the micro-propulsion system on the spacesuit.

　　This system is actually designed to make astronauts move and adjust their posture more flexibly in space. It consists of four nozzles, located in the chest and waist respectively. Each nozzle can spray nitrogen or water vapor in four directions, thus generating a thrust. By controlling the nozzle switch and time, astronauts can change their speed and direction. Although this system is relatively simple, it also has certain effects. For example, in the movie "Mars Rescue", the protagonist mark wotte Ni used this method to successfully dock with the rescue spacecraft.

　　Of course, in the actual situation, both methods have great limitations and risks. First of all, astronauts must react immediately after falling into space, and accurately judge the position, speed and direction of themselves and the spacecraft. Secondly, astronauts must have enough articles or gas to generate thrust, and save use and avoid waste. Finally, astronauts must be within the communication range of the spacecraft in order to keep in touch with the spacecraft and coordinate their actions, otherwise they will lose their direction and goals.

　　Therefore, if an astronaut accidentally falls into space, it is very difficult to return to the spaceship. Moreover, even if you return to the spacecraft, you may not be able to land safely. Because the spacecraft may have been damaged or there is not enough fuel and oxygen. Moreover, waiting for rescue in space is also very dangerous, because there are many unpredictable factors in space, such as solar storms, asteroids, space junk and so on. Therefore, astronauts must take various protective measures to ensure their own safety when they leave the cabin in space.

　　Astronauts are a group of brave explorers. They risk their lives to go out of the earth and explore the universe for the sake of human science and progress. Their work is very glorious and great, but it is also very hard and dangerous. We should respect and support them, and we should also pray and bless them. I hope they can come back safely and bring us more knowledge and surprises.