Military Technology

After having a delicious dinner at the restaurant in Haoyu Science and Technology Park, these reporters and bloggers began to head towards the Xinyuehu Space Command and Control Center.

Of course, it is impossible for these two hundred people to enter the control center hall. They can only visit the entire aerospace command and control center through the guest viewing area on the second floor and then exit.

There is a large screen outside, which will always display relevant public data information for these people to watch.

Of course, there will still be several media reporters entering the hall. Who is a heavyweight media reporter? Naturally, he has this privilege.

At 8:30 in the evening, Wu Hao arrived late with Lin Wei, Zhang Jun and others. In fact, there is still more than an hour before landing, which is enough time. However, in the eyes of the public, it is a different story. Everyone will think that Wu Hao and the others have limited attention to this mission, so they arrived too late.

Seeing Wu Hao and the others coming, Yu Chengwu, Zhou Yonghui and the others immediately came up to greet them.

Mr. Wu!

Wu Hao smiled and said hello, then turned to look at the big screen and asked, "How are you now?"

Hearing Wu Hao's inquiry, Zhou Xiangming replied with a smile: "At present, the situation of the lander is normal, and then we will look at the final landing stage. This is also the most dangerous and critical stage of the mission. Success or failure depends on All of a sudden.”

It's okay, just calm down and everything will proceed normally. No matter what the result is, we can accept it calmly. After all, there are not many precedents for a task like this. We are all doing it while exploring, so it is normal to encounter bumps and don't worry too much. Wu Hao patted Zhou Xiangming's arm and comforted everyone with a smile.

Hearing his words, Zhang Jun, Yang Fan and the others all laughed, while Lin Wei rolled her eyes at Wu Hao and said angrily: "You, you are thinking about failure before this has even started. This is too much." It’s unlucky, just give it a few quick breaths, this mission will definitely be successful, I believe everyone.”

Hehehehe...

After hearing Lin Wei's words, everyone present laughed again.

Thank you, Mr. Lin. Yu Chengwu, Zhou Xiangming and others were distracted and Lin Wei thanked them.

Well, my fault, it's my fault, I shouldn't have said this. Wu Hao apologized again and again, then looked at everyone and said with a smile: "Okay, let's not talk about it next to each other. Sit down and watch slowly. There is still a while."

After hearing Wu Hao's words, everyone immediately smiled and walked to the guest table to take their seats. Sitting on one side of Wu Hao was Lin Wei, and on the other side of Wu Hao was Zhang Jun.

As for the responsible persons such as Yu Chengwu and Zhou Xiangming, they are sitting in the row in front of them. So even if there are any problems, they can communicate at any time.

In the middle of the big screen is a lunar satellite photo. There are circles of green lines drawn in the photo. The end of the green line is a bright spot. This is the lander of the lunar cargo transportation system, and the green line is It has circled the orbital trajectory of the flight.

In front of the bright spot is the red line, which represents the track that has been planned but has not yet been passed by the lander. Therefore, everyone can clearly see what stage the entire landing process is at.

"Currently our lander is continuing to fly around the moon, constantly lowering the orbital altitude and adjusting the orbital angle. When it reaches the orbital angle we require, the orbital altitude has also reached the height we designed, which is the distance The moon's surface is approximately fifteen kilometers.

When it reaches the sky above Zhihai, the lander will immediately perform a powered descent. The entire descent height is about 15 kilometers, which is 15,000 meters. It takes about 14 minutes to land from the descent path.

During this approximately fourteen minute descent, we are reducing the lander's speed from 1.7 kilometers per second to zero. In other words, during the entire landing process, our thrust engine will continue to slow down the lander. This process is very critical.

If the deceleration is too slow, the speed of the lander will be too fast, and the landing speed will be too fast, which will cause the entire lander to crash. Isn’t that what the lunar surface probe of a certain large country in South Asia is like? "

Yu Chengwu leaned forward and introduced Wu Hao and the others with a smile.

Ha ha ha ha……

His words caused a burst of laughter from the guests. Indeed, Ah San's moon-facing detector was a popular source of ridicule for many people.

Is the moon's orbit so low? It's 15,000 meters. If you put it on the earth, it would be the height of a jet plane. At such a low altitude, wouldn't the lander just fall down? Zou Xiaodong, who had just returned from the South China Sea, asked curiously.

Although he stayed in the South China Sea for a few days, this guy had already tanned, and his skin color was completely different from that in the South China Sea. Sure enough, the sun there was still too strong.

Hehehe, everyone present laughed when they heard Zou Xiaodong's question.

Yu Chengwu also smiled and explained: "No, the volume of the moon is only one-eighth of the earth, the radius is one-quarter of the earth, and the weight is only one-eighty-one times of the earth.

Therefore, the moon is very small and has a very light mass, so the moon's gravity is also very small, so its gravity is only one-sixth that of the earth, which is 0.17.

In other words, the Earth's Kármán line is 100 kilometers. This line distinguishes the Earth's atmosphere and space. Above this line, there will be a weightless effect. Below this line, you can feel the Earth's gravity.

The moon's gravity is only 17% of the earth's, which means that the moon's Kármán line should be about 17 kilometers, but in fact there is some deviation. Coupled with the lack of atmosphere on the moon and the ultra-high orbital speed of the lander, it will not fall down to a position of fifteen kilometers.

In addition, we want the lander to land, so we naturally hope that it can lower its altitude. This has been carefully calculated and there will be no problems. "

"Is this the same for Shengsheng?" Zou Xiaodong asked immediately after listening to Yu Chengwu's introduction.

Rising from the moon is roughly the same, but there are some differences. The main thing is to use the centrifugal force generated by the moon's autobiography. Here, you can use less fuel and thrust to push more objects up. This point It is the same as launching rockets on earth.

This time the landing site is approximately how far away from the location of the lunar surface scientific research station we selected. Lin Wei immediately became curious after hearing Yu Chengwu's introduction.

Hearing the boss's question, Yu Chengwu immediately cheered up and answered enthusiastically: "It's about two hundred meters to five hundred meters. It depends on the landing accuracy of the lander. If the accuracy can be controlled, then the landing point of the lander It will be very accurate, and it will be only about two to three hundred meters away from the selected site, which will facilitate the subsequent transportation of materials."