The moon, the natural satellite of the earth, which almost always represents the meaning of beauty in the myths of various civilizations on the earth, is actually a small gray planet without an atmosphere and the surface has been hit by various meteorites. If you look at it up close, you won't feel anything but desolation, but when you look at the earth from this place, you will feel that the birthplace of mankind is so beautiful.

But at this moment, Xia Yu didn't have the heart to see how beautiful the earth was, and his spirit was all tied to his target, the hatch of the Shenzhou spacecraft.

At a distance of 30 meters, he drifted over like this, but on the way, except for seeing the distance getting closer and closer, Xia Yu himself didn't feel anything. Stretching his hands forward, he grabbed the handrail outside the hatch tightly, but the inertia that floated over still made Xia Yu's body hit the hatch, but with the protection of the thick spacesuit, nothing major problems happened.

Unscrewed the hatch, Xia Yu got into it and fixed himself, and then signaled to the other side that he was ready, on the Shenlong, Wang Pengyu began to slowly climb along Xia Yu's safety rope, and then to Wu Degao, and the three of them all entered the Shenzhou spaceship.

For space-specific spacecraft like the Shenzhou spacecraft, Wu Degao has received much more training than Xia Yu and Wang Pengyu, so he has now become the captain, and the control of the Shenzhou spacecraft will be handed over to him. Skillfully opening various instruments and confirming that the cabin has been pressurized, Wu Degao said: "You can take off your helmet." ”

Hearing Wu Degao say this, Xia Yu and Wang Pengyu hurriedly removed the spacesuit parts such as helmets and gloves. Although the spacesuit can ensure the safety of the astronaut's life, don't expect too much in the comfort area, although the weight is not felt in the weightless environment, but the body's activities are still limited to a certain extent, so as long as the situation allows, no astronaut wants to wear this thing all the time.

"The ignition of the Shenzhou spacecraft is ready." Wu Degao put his finger on the ignition button, he was ready to start the engine of the Shenzhou spacecraft, but before that, Wu Degao still turned his head and looked out through the glass window of the Shenzhou spacecraft, thirty meters away, the cold and broken Shenlong was floating there quietly at the moment, like an arrogant Shenlong, disdainfully facing the Shenzhou spacecraft with his broken body, but the black cockpit glass window seemed to be a pair of affectionate eyes looking at Xia Yu and the three of them, as if they were watching them leave.

"Say goodbye to the Dragon." Wu Degao said, raised his right hand at the Shenlong, and saluted solemnly and solemnly. Xia Yu and Wang Pengyu also said goodbye to the Shenlong in their hearts, and in the future, I am afraid that they can only meet this Shenlong again in their own memories.

"Five-second ignition countdown." The three of them fixed themselves in their seats, and Wu Degao pressed the ignition button after the countdown, and the tail of the Shenzhou spacecraft began to spray flames. Xia Yu and the three of them only felt the seat behind them push forward, and then as the Shenzhou spacecraft began to accelerate, preparing to leave the lunar orbit, which was an overload that Xia Yu and the three of them had not felt for more than ten days.

Compared with the Shenlong, the Shenzhou spacecraft is much narrower. The interface between the cabins is only 65 centimeters in size, and it is necessary to be precise and dexterous when traveling back and forth, otherwise it is easy to hit the bulkhead. However, what made Xia Yu and the three of them happiest was that among the food types equipped with the Shenzhou spacecraft, there were also eight-treasure rice and lotus seed porridge, and even stir-fried vegetables and tangerine peel beef and other space foods with rich flavors, which made the three people who had been eating highly concentrated nutritional capsules that had nothing to do with the taste for several days in a row were overjoyed.

However, even if you like it, you still have to control the amount of food. In addition, astronauts have little appetite in weightlessness, and they cannot eat enough food, otherwise it is difficult to keep what they have eaten in their stomachs, and if they accidentally vomit because they are too full......

Well, imagine for yourself those mosaics flying around.

As it took three days for the Shenzhou spacecraft to return to low-earth orbit after leaving the lunar orbit, the relevant staff on the ground began to be busy again, with the previous experience of successfully rescuing the astronauts on Tiangong-1, everyone was full of confidence in the success of welcoming back Xia Yu and the three of them, so they were not too nervous.

However, not being nervous does not mean that you can relax at will, and no one dares to be negligent before Xia Yu and the three of them really land safely.

In a low-earth orbit of 270 kilometers over the South Atlantic, the Shenzhou spacecraft carrying Xia Yu and the three of them has approached the window to return to the earth's surface. The so-called window, in fact, is about the same as the launch window, that is, the fixed route when the re-entry capsule breaks through the atmosphere, in order to make the re-entry capsule accurately land at the main landing site, accurate control of the descent angle and time point is necessary, otherwise with the operating speed in orbit, a deviation of 1 second can make the ground landing point of the landing capsule deviate by more than 9 kilometers.

Therefore, in order to minimize human misoperation, the return capsule is basically controlled by a computer when performing ground return operations.

"Propulsion module separation." On the information wall of the flight control center, the picture of the Shenzhou spacecraft captured by the ground and satellites is being displayed in real time, and it can be seen that after the Shenzhou spacecraft adjusts its attitude under the control of the computer, the orbital module is separated and continues to operate in space, and then the attitude continues to adjust, and after the ignition and braking of the propulsion module begins, the Shenzhou spacecraft cabin, which has slowed down significantly, begins to reduce its altitude and prepares to enter the atmosphere.

In just a few minutes, the Shenzhou spacecraft has descended to an altitude of about 140 kilometers above the ground, and after the separation of the return capsule from the propulsion module, the return capsule, which was seized by the earth's gravity, began to break into the denser and denser atmosphere along the descending curve at a certain angle.

Xia Yu and the three of them sat in the return capsule, and the safety straps firmly fixed them to the seats, and they all knew the changes in the spacecraft in just a few minutes. When it began to break into the atmosphere, the capsule began to shake violently because of the friction with the air, and looking out of the window, the hot air had turned into an orange fireball to envelop the capsule, and the ablative insulation material at the bottom of the capsule was like a branch burned by a fire, making a crackling sound, and at the same time, debris that had lost its heat protection effect was constantly detached from the capsule.

At the same time, the observation stations on the ground can clearly see that a bright spot like a meteorite drags a long tail flame across the sky, and in the optical images of ground observation, you can also see some bright spots scattered with broken stars at the same time. When the speed of the re-entry capsule became slower and slower, and finally it was no longer slow enough for the air to burn, the guide parachute was automatically opened, and along with the guide parachute was pulled out was the deceleration parachute and the main parachute, which covered an area of more than 1,200 square meters.

When the main umbrella of the return capsule was opened, the entire flight control center boiled, in their expectant eyes, the return capsule fluttered down, and in the picture from the helicopter responsible for the scene of air search and rescue, when there was still 1 meter from the ground, the landing engine was successfully ignited, and several flames were shot out, while blowing the dust on the ground, it also slowed down the descent speed of the return capsule to less than 2 meters per second.

In the return capsule, with a loud bang and a pause, Xia Yu and the three finally no longer suppressed their joy, and shouted with a smile: "We, we're back." ”