In low Earth orbit, Tiangong-1 has recovered all the astronauts into the capsule, and the astronauts will prepare to activate the thrusters of Tiangong-1 to shift to avoid space junk that may collide in orbit later.

Space junk is also called space debris or orbital debris, and all useless man-made objects that orbit the Earth in space fall under the category of space junk.

These debris generated by scrapped satellites, launch vehicles and spacecraft during launches, as well as solids and liquids escaping from spacecraft, astronauts' household waste, peeling paint, and even dust, can pose a threat to the operating spacecraft.

Nowadays, there are more than 4,500 tons of space junk flying in low earth orbit, they are of different sizes, most of them move at a speed of 6-7 kilometers per second, threatening spacecraft such as the space station in operation at any time, as long as the area reaches more than 10cm of space junk, it will be called a spacecraft killer, because in the face of space junk moving at a speed of more than 10,000 kilometers, no matter what spacecraft, with the current level of human science and technology, there is no other way except to give up their position to avoid being collided.

Tiangong-1 was the same, the main thruster ignited, and according to the results obtained after calculations, it took 5 minutes and 40 seconds to ascend to an altitude of 800 meters.

It is not uncommon for spacecraft to change its position to avoid space junk, and the International Space Station has also changed its altitude several times because of space junk, but for Tiangong-1, this is the first time after the manned operation, so the attention is relatively high.

"Expect one more minute of visual contact." Xie Dong floated in the core cabin and looked out of the window, on the huge blue planet, several white clouds scattered on the surface of the planet were slowly flowing, this kind of picture would not feel boring no matter how many times he watched it, because in the vast universe, in the solar system, this is the only scenery that can be enjoyed.

In the distance, in the debris of the satellite and rocket that is rapidly approaching Tiangong-1, when a satellite wreckage with an area the size of a football hits another relatively large fragment at a speed of 8 kilometers per second, at an angle of 30 degrees, it is like a baseball that has been knocked away, and the satellite wreckage instantly changed its direction of travel and flew towards the orbit where Tiangong-1 has been elevated. Observed by the Space Target and Debris Observation and Research Center of the Chinese Academy of Sciences, the computer of the observation and research center calculated the overlap point between it and Tiangong-1 after a minute and a half minutes later almost at the moment when the debris collided and changed the original trajectory.

Almost immediately, the flight control hall received an alarm call from the observation center, and the sudden change surprised everyone. As a space station, Tiangong-1 itself does not have the ability to move quickly, and it only increased the altitude by 1,000 meters before, but it took more than five minutes. It is now impossible to re-ignite the thrusters in tens of seconds, to get out of the way of a possible collision zone, and there is not enough time. One can only hope that the debris will pass by the space station instead of crashing directly into the body of the space station, and the only thing everyone in the flight control hall can do at this time is to pray silently after notifying the astronauts in the space station.

In the space station, Xie Dong and two other astronauts immediately put on the heavy spacesuit again as quickly as possible when they received that there was debris that might hit the space station, at this time Xie Dong had no care to observe the space debris that was about to pass through the orbit of the previous space station, they must put on the spacesuit as soon as possible, and then enter the Shenzhou spacecraft, get out of the space station as quickly as possible, and wait for the debris to pass by and return to dock again, so as to avoid the risk.

Unfortunately, it was too late. When the three astronauts put on their spacesuits, came to the interface with the Shenzhou spacecraft in turn, and were about to drill into the Shenzhou spacecraft, there was no warning at all, and suddenly at the same time as a loud bang, one-third of the entire interface was directly opened, and then the whole broke apart in the frenzied air flow, and at the same time all kinds of debris splashed around, the Shenzhou spacecraft used for emergency escape was thus freed from the shackles of Tiangong-1 and drifted away silently.

But at this time, the three astronauts had no time to take care of the Shenzhou spacecraft. When the explosive decompression occurred, the frantic air currents pushed the three astronauts out of the breach in an instant, they were like veneers swept away by a flood, and they were powerless to resist.

Xie Dong, who was walking in the first row, grabbed the handrail next to him the moment he was blown away, but the other two astronauts who were caught off guard hit him directly and knocked him out. At this time, the three of them were wearing in-cabin spacesuits, which were not equipped with oxygen supply equipment and gas thrusters like extravehicular spacesuits, in this case, they couldn't control their body posture and direction of travel in space, once they were blown away, the astronauts who were only wearing in-cabin spacesuits were in space, and the emergency oxygen supply equipment could only make him last for about an hour, and then? He doesn't have it anymore. Astronauts who have lost their stress protection will be tortured by the world's most brutal death before dying completely from lack of oxygen.

The water in his body will 'boil' into water vapor due to the sharp reduction of pressure, and then his body will expand, which is why some scientists have said before that if the human body is exposed to a vacuum, it will explode and die, but this qiē is not something that happens in an instant.

The gas that turns into water vapor will spew out from his eyes, mouth, nose, ears and other places, and at the same time, due to the evaporation of water, his body temperature will also drop rapidly, his mouth and nose will begin to freeze, and then his whole body will tremble and convuls, and his skin will become purple and blue, which is extremely scary. He endured these cruel tortures for a minute and a half before he died completely.

This is an extremely cruel way to die, every astronaut will learn it during training, and every instructor will always emphasize repeatedly when teaching, don't expose yourself to a vacuum.

Fortunately, Xie Dong reacted very quickly and grabbed a cable that was floating outside the cabin due to breaking and breakage before it was completely blown away, and was temporarily hoisted outside the cabin. The process of decompression has ended, and there will be no more riotous air currents rushing out to threaten the lives of several people, the two astronauts fixed themselves, and looked at Xie Dong, who was still floating outside the cabin, and couldn't help but breathe a sigh of relief.

Grabbing one end of the cable with both hands, the two planned to work together to pull Xie Dong into the space capsule, thinking that there was no danger Xie Dong also said to the two of them on the other end of the cable: "Damn, Liu Hongliang, you two scared me to death, fortunately I reacted fast enough, otherwise it would be really dangerous, it seems that I am really lucky." ”

But his luck ended there. As soon as he finished speaking, the two astronauts Liu Hongliang and Yang Yi, who were pulling the cable, were about to respond to him, a black shadow seemed to be the scythe of death shuttling through space, and at the moment when the two of them didn't even react, it slashed past Xie Dong's waist. When the two people in the capsule realized what was happening, in their frightened eyes, Xie Dong's whole person suddenly broke into two, and his internal organs were sprayed out of the truncated place by huge pressure, and quickly splashed out in all directions.

"Vomit ......" Liu Hongliang or Yang Yi, both of them could no longer look directly at Xie Dong's corpse that was drifting away in the distance, they were nervous, scared, frightened, uneasy, and all the negative feelings were magnified countless times because of Xie Dong's death. One of them couldn't hold back and vomited inside the closed spacesuit.