At this moment, time seems to pass slower, and every minute and second is a kind of torture for everyone. They are scared, but they are very much looking forward to the arrival of the last moment.
At this moment, the picture transmitted back through the external camera at the bottom of the lander has shown a panoramic picture of the area where the lunar scientific research station is located. It includes the completed communication data antenna, solar panels, and the previous lander, as well as
A portion of the research station foundation has been printed out.
Of course, the most striking thing is the area where the landing site is located. The "Wangshu-2" lunar surface patrol rover previously drew a large circle and some small circles in the landing site area. These circles are very obvious.
It can be seen from the lunar orbit.
At this moment, the external camera at the bottom of the lander also saw the circle and found the location where it was about to land. A large cross mark had appeared in a circle. This was the lander for the Lunar Cargo 2 spacecraft.
The planned landing site is located not far from Lander No. 1, about a hundred meters away, which is very close.
The reason why the plan is so close is of course because this kind of landing technology is still relatively mature at present, so we dare to set the landing site so close.
On the other hand, setting the landing point so close is also conducive to the transshipment of cargo later. If it is too far away, it is not conducive to the transshipment of subsequent cargo, and it will also occupy the space of the landing site and affect the landing of the lander below.
The lander's intelligent control system has clearly captured and identified the landing cross surface, then locked it, and began to adjust the angle and direction of the lander's descent based on the landing site landmark as a reference to achieve precise landing.
Glancing at the leaders who were paying close attention to the picture on the screen, Wu Hao smiled and introduced: "The entire landing process is not a one-time event, but is carried out in stages.
This is one stage from orbiter separation to orbit adjustment, the second stage is the orbit change and landing to a height of one hundred meters above the moon, and the third stage is from the one hundred meter position to landing."
After hearing Wu Hao's introduction, everyone began to be puzzled. One leader immediately asked: "Why not land directly on the moon from space, but instead go to a height of 100 meters in stages? Is there any explanation for this?
"
Seeing the leader's inquiry, Wu Hao explained with a smile: "Actually, the reason is very simple. It's like when we do some complex movements, we often can't do it right at one time. Then at this time, we will decompose the movements and divide the entire complex movements.
Divide it into several steps and complete it at once, which can greatly reduce the difficulty of this action and make it easier to complete.
The same goes for the lunar exploration and landing process. It can be divided into several steps to complete. Each stage has its own tasks and priorities.
As for why this 100-meter altitude is designated, it is because the lander needs to reduce its landing speed to zero at this altitude."
Looking at the doubts on everyone's faces, Wu Hao smiled and continued to explain: "There are many reasons for setting this height or this action.
First of all, the first point is for safety and insurance. Because during the ten-minute descent and landing process, problems may occur due to various reasons, resulting in errors in the descent speed and altitude. This height of one hundred meters above the ground is equivalent to a
Buffer height. Without it, if the lander lands directly on the earth, these possible errors may affect the landing speed angle, resulting in the lander crashing, rollover damage, etc.
With such a buffer height set, even if there are some errors during the first ten kilometers of descent, there will still be a height that can be buffered and adjusted. In this way, the success rate of the entire descent and landing process will be greatly improved.
The second point is that the lander will hover at this height for a few seconds, use its external cameras, lidar and other detectors to detect the terrain below, draw a detailed terrain map, and then select a more detailed terrain map.
Land on a flat position.
We all know that there are many craters and rocks on the moon. If the landing position is not good, you are likely to fall into the craters, or hit the rocks and cause damage to the equipment, or the uneven landing will cause rollover, etc. So this
It's a kind of insurance.
Although our landing site was developed and explored by the Wangshu-2 lunar surface patrol rover, to be sure, we added this procedure to ensure that the lander can land safely.
Not only us, but other detectors in our country and detectors in other countries also proceed in this way."
"The lander begins hovering."
At the same time as Wu Hao was introducing, a technician on the scene shouted. After everyone heard the words, they immediately looked at the big screen, and saw that the falling picture on the big screen suddenly stopped. The circle and the cross landmark in the center were exactly in the picture.
After about three or four seconds of being still, the whole picture began to move again. The cross mark below became bigger and bigger, and then with a burst of dust flying, the whole picture began to become dim and still.
Just when many of the leaders' entourage, including many reporters and guests, were confused, warm applause and cheers broke out, and all the technical staff stood up and cheered.
Bang bang bang...
Only then did the leaders realize what was going on, and they immediately applauded. Under their leadership, others accompanying them also applauded.
"Xiao Wu, congratulations!" the senior leader extended his hand to shake Wu Hao's hand.
"Thank you, leader!" Wu Hao did not say too many words of thanks, but simply said thank you. With their current close relationship, there is no need to say these words. Those words should be left to those who are not familiar with them.
Hehehe...
After some pleasantries, the latest images were also transmitted back on the screen, whether it was the first-person view image uploaded from the lander, or the image uploaded from the No. 1 lander, as well as the "Wangshu 2"
From the surveillance footage on the lunar surface patrol and exploration vehicle, it can be seen that the No. 2 lander landed smoothly on the lunar surface.
In particular, the high-definition images sent back by the "Wangshu-2" lunar surface patrol rover also allowed everyone to see the spectacular scene of the lander landing from the lunar surface for the first time, and it was so close.
This feeling is as exciting as watching the manned spacecraft return capsule land on the ground. Especially when the lander finally landed on the moon and the engine blew up the lunar soil, the spectacular scene was unforgettable for everyone. It is difficult to imagine this
