The stars and the sea are the pursuit of human beings all along. Whether in Chinese or foreign mythology, flying in the sky is people's prayer and desire. As early as the end of the Yuan Dynasty and the beginning of the Ming Dynasty in China, tens of thousands of households sat on the homemade "rocket chair" to pursue the long-cherished wish of the flying sky, and finally sacrificed their lives.
In the modern period, with the continuous development of science and technology, human beings have broken through the limits again and again. In 1957, the former Soviet Union launched the world's first artificial satellite, and humans began to advance into space. Since then, human exploration of the outer space of the earth has not stopped. For more than half a century, human space technology has made tremendous progress. From launching the first artificial satellite, to manned spaceflight, to landing on the moon, we are gradually surpassing the limits of cognition.
China's aerospace industry, due to the poverty and weakness of the domestic environment in the modern period, started late, but still achieved impressive results. On April 24, 1970, China launched the first artificial earth satellite, Dongfanghong I, representing that China became the fifth country after the Soviet Union, the United States, France and Japan to launch artificial satellites independently. China's aerospace industry also officially started at this time.
China's aerospace industry has developed from scratch, condensing the painstaking efforts of countless astronauts, and it is inseparable from the persistence and struggle of its predecessors, which is full of hardships and challenges. If you recall the exciting moments in China's aerospace history, I believe many people will think of the smooth lift-off of the Shenzhou V manned spacecraft.
Indeed, the successful launch of Shenzhou 5 is a monument to China's space industry, and astronaut Yang Liwei is a witness to this historic event. Not only that, Yang Liwei is also a pioneer in China's manned space industry, providing very valuable experience for China's subsequent space operations.
At that time, although China had successfully launched four spacecraft, it still had no experience in manned space flight as a reference. In the face of the vast expanse of outer space, any accident can happen at any time. For example, when Yang Liwei was on a space mission, he once heard a "knock at the door" in space, did the alien creatures really exist? Fortunately, he returned in time.
As an excellent air force pilot, Yang Liwei was selected into the Chinese astronaut brigade in 1998 and became one of the first generation of Chinese astronauts. In the army, Yang Liwei received various arduous trainings and performed very prominently, and was finally rated as a third-class astronaut and was ordered to carry out the Shenzhou-5 space mission.
To be able to make the first flight, Yang Liwei felt supremely honored, but he also needed to face unknown challenges. Because the first flight means crossing the river by feeling the stones, various uncertain factors may lead to failure. Sure enough, the rocket had problems when it was launched. After the rocket was launched, there was a phenomenon of low-frequency resonance.
Under the huge overload pressure, Yang Liwei's body almost reached the limit of what it could withstand. According to the space hero's later recollections, at that time he felt that his internal organs were shattered, and even had a feeling of imminent death. The resonance lasted a total of 26 seconds, and Yang Liwei also survived the most difficult moment of the space mission.
Fortunately, the spacecraft eventually stabilized, successfully lifted off and entered the intended orbit. In space, Yang Liwei carried out various space missions in accordance with the instructions of the ground command center, and the spacecraft also ran smoothly in the established orbit. However, when the spacecraft flew around the ground for 14 weeks and decided to return to Earth, there was a sudden "knock at the door" inside the spacecraft.
For this sudden situation, despite undergoing rigorous training, Yang Liwei was also very surprised. As an astronaut who entered space for the first time in China, Yang Liwei did not have any previous experience as a reference, and he could only rely on his own judgment when encountering various problems. Where does the "knocking on the door" come from? Could there be other creatures in outer space? Yang Liwei considered various possibilities, but did not act without authorization, but reflected this situation to the ground command center and returned in time according to the plan.
After successfully returning to the ground, Yang Liwei reflected two situations to the relevant personnel. One is the low-frequency resonance phenomenon that occurs during the launch of the rocket. After the continuous attack and transformation of scientific researchers, this problem was solved when the Shenzhou VI spacecraft was launched. The second is the "knocking on the door" heard before returning home.
Upon learning of this, the researchers immediately launched an investigation and found that there were no other signs of life around the spacecraft at that time, and there was no "knocking" on the door of alien creatures. Eventually, after a long period of research and investigation, the experts came to the conclusion that there was a problem with the spacecraft itself.
As we all know, the environment of outer space is extremely complex, and the spacecraft must not only withstand huge pressure, but also maintain stability and smooth flight under the huge temperature difference changes. This is a very strict requirement for the structural design and material selection of the spacecraft. Although the spacecraft has been tested in various experiments, the environment in outer space is still impossible to fully simulate. Therefore, the "knocking sound" at that time was made by the spacecraft due to the sudden change in surface temperature and slight deformation, which sounded like someone outside the cabin was knocking on the door. The deformation of the spacecraft is undoubtedly very dangerous, fortunately, Yang Liwei returned in time.
The complete success of the Shenzhou-5 manned space mission has not only enhanced China's international status, but also provided valuable experience for China's manned space industry. After this, the Shenzhou series of spacecraft continued to take off, carrying the flying dreams of the sons and daughters of China for thousands of years, going to distant space. And Yang Liwei, as a space hero, his contribution will also be remembered.