......In outer space, which is more than 300 kilometers away from the earth's surface, the Shenlong is tumbling and spinning in no order, the continuous alarm sounds are ringing rapidly, and the display screen of the on-board computer is full of fault report entries that stimulate everyone's nerves.

"How's it going over there? I see the screen full of glitch entries! Wang Pengyu shouted loudly, and the huge blue planet flashed out of the glass window of the cockpit again, Wang Pengyu didn't even glance at it, staring at the dashboard in front of him. The entire cockpit was shaking violently, and a few muffled 'clicks' could be heard from time to time, and the weird rolls and spins had made him lose his sense of direction.

"I saw it too!" Xia Yu shouted, he had lifted the autopilot, and was trying his best to correct the flight attitude of the Shenlong, the sudden drastic change did not make his thinking stagnate, Xia Yu calmly and decisively issued a command order: "I adjust the attitude of the plane, Peng Yu, you perform the checklist, Lao Wu, you turn off the alarm, Du Junbao and Wu Min, you two check the condition of the plane."

As Xia Yu's voice fell, everyone hurriedly acted according to the order, Wu Degao checked the alarm entry on the monitor, turned off the alarm and shouted out the content of the alarm at the same time: "Left wing hydraulic alarm, left rear cabin decompression alarm, body attitude abnormal alarm, hydraulic control system alarm, engine failure alarm ......"

Speaking of this, it seemed that he had seen some bad information, Wu Degao's voice actually paused unexpectedly, Xia Yu and Wang Pengyu instinctively looked at the alarm display, and then couldn't help but feel a chill in their hearts, Wu Degao's somewhat trembling voice came into everyone's ears: "Rear cabin fire alarm!" ”

Four hours ago, in low-earth orbit 420 kilometers above the ground, a bright white exterior opened all solar panels, in the shape of a 'T', with a total mass of more than 60 tons, with a core module, two real yàn modules, and the installation of an external robotic arm on the Chinese manned space station, codenamed Tiangong, was also carried out on the Shenzhou spacecraft.

This is the first large-scale spacewalk operation carried out by a resident astronaut outside the capsule since the official operation of China's space station. Tiangong-1 is China's first manned space station operating in low-earth orbit. Before the construction of this space station, there was originally a proposal to join the construction of the International Space Station, but at that time, the United States refused China's participation on the grounds that the technology of the space station could be used for military purposes, which made China determined to build its own space station.

However, what is more ironic is that when China is using its own scientific and technological strength to break the technological blockade of the West and is no longer suppressed by Western countries in terms of space technology, the United States strongly invites China to join in the construction of the International Space Station.

Once it joins the construction of the International Space Station, not only will its own space technology level be guessed, but it will also be limited by them, greatly slowing down its own scientific and technological development.

Therefore, despite the huge cost of building the space station alone, and despite being criticized by some media in this regard, several leaders led by the first leader still adhere to the established strategic guidelines and fully support the construction of the space station.

Until today, the Chinese space station, which has cost countless manpower and financial resources, has finally been built and put into use. The technological progress that can be brought about by the operation of the space station can not only be applied to the research of military use and space technology, but also the role of the research on the application of materials such as alloy smelting cannot be ignored, and in this regard, it is China's long-term shortcoming.

Space smelting technology can greatly improve the scientific research progress in the application of materials, and many special metals can only be synthesized or studied under weightless conditions, such as aluminum-tungsten alloy. Because aluminum is a light metal, the melting point is very low, only 660 degrees can melt it, its boiling point of 2467 ° compared to the light melting point needs to reach 3410 ° of heavy metal tungsten, these two completely different properties can not be fused together, because tungsten has not melted, aluminum is vaporized. However, in space, where the meaning of specific gravity is lost, the situation will change, and the solid tungsten block will be evenly dissolved in the molten aluminum, so as to obtain an aluminum-tungsten alloy that cannot be made on the ground.

A Japanese scientific research group has also used space smelting technology to manufacture superconducting materials with zero resistance, and there are many, many such scientific research inventions, which can only be done in space, so the construction of China's space station will continue, and the installation of extravehicular robotic arms is just the first step in all projects.

"Xie Dong, your breathing is a little faster, move more slowly, control the rhythm of your breathing."

Xie Dong, a resident astronaut, is screwing a robotic arm, and what can be done in three or five seconds on the ground is completely different from doing it in weightless space. When the electric screwdriver rotated, Xie Dong had to grasp other things with his hands to fix himself, otherwise when the electric motor turned, it was estimated that before the screws were locked, it would become Xie Dong himself.

"Okay, understood." Xie Dong replied. There is no sound in space, only one's own breathing and heartbeat can be heard, and the loneliness and lack of security are magnified several times. After a long time, it is easy to have a strict psychological impact on astronauts. Therefore, when carrying out extravehicular operations, the physiological state of astronauts is generally monitored in real time, and once the body temperature, breathing and heartbeat exceed the standard, they must stop a qiē action, and if necessary, they will be asked to return to the capsule.

In space, the operation of the Tiangong-1 space station is proceeding step by step, on the ground, the flight control center also needs to monitor the information in space in real time, a qiē is normal, no one is worried about what accidents will happen, but the development of things usually does not move by human will.

"Report, the Russian side just called, one of their abandoned satellites collided with the wreckage of an Indian rocket, has been turned into fragments, and is expected to pass through the orbit of our space station in 73 minutes." Xiao Li of the Ministry of Communications informed the command area through the internal telephone system, and then the telephone of the Space Target and Debris Observation Research Center of the Chinese Academy of Sciences, which is located at the Purple Mountain Observatory, also called the command area, and they also observed the situation and made a report.

"Notify Tiangong-1 to immediately end the extravehicular operation and let them evade. At the same time, the satellite debris is tracked throughout the process to ensure that the debris does not collide with our space station! "The on-site commander immediately gave the order.

Just as Tiangong-1 was recovering the astronauts and preparing to transfer their positions, Shenlong was doing ground tests at an air base on the ground.

It has been lifted off several times, and although the Shenlong watch is not perfect, it is definitely an aerospace aircraft with excellent performance, at least it has successfully brought the members of the test flight team into space and returned to the ground safely. With such an experience, the research and development progress of the DPCA project has once again taken a big step forward.

Today's plan is to transfer the flight, and the Shenlong will transfer from this secret air base to another test flight base with a less secret Cheng dù, and the reason for this is because some time ago the United States tested the hypersonic vehicle again, and after success, in order to maintain pressure on the other side's space program, it was decided to reveal some information about the Shenlong to the outside world. It's not the first time this kind of open and secret battle has happened, so Xia Yu and the others don't think there's anything new about it, for them, this is just an extremely ordinary flight mission, they just need to complete it as planned.

Hauling the Shenlong out of the hangar, refueling, and carrying out the pre-takeoff inspection procedures, Xia Yu and the others relaxed and happily did the work in hand, these things they had done countless times, nothing particularly noteworthy, but just when the Shenlong was full of fuel and was about to enter the take-off runway, a sentence from the tower "suspend takeoff" disrupted their original plan.