中国空间站 On currently on 24th to 26th December 2021 Christmas eve, CNSA –China National Space Administrationin collaboration with CCTV9 China Central Radio and Television will telecast “Our Journey” is the first panoramic documentary produced by China National Space Administration and China Central Radio and Television in 4 years to show the complete course of China’s lunar exploration project in 17 years . It is a documentary. Documentary works with international vision, international expression, and international standards are excellent works that tell Chinese stories, spread space culture, and popularize space knowledge
The documentary consists of three episodes, each of 50 minutes, which truly presents the development of China’s lunar exploration project over the past 17 years, which has been through ups and downs, and left a tortuous but full history. This imprint records not only a huge and complicated super project, but also a testimony to the rapid growth of China’s aerospace industry and the common progress of the Chinese nation. The film fully and vividly interprets the spirit of lunar exploration of “chasing dreams, exploring courageously, coordinating fortifications, and win-win cooperation” , promotes the spiritual pedigree of the Chinese Communists , and conveys the spiritual power that China’s scientific and technological development and progress rely on.
Through character interviews, important development scenarios, and the combined application of various methods such as related materials, the film outlines the continuous and staggered cooperation and support between the various development units of the major systems, and demonstrates the Chinese people’s fearlessness in scientific exploration. Pursuit, as well as the admirable courage and wisdom devoted to this journey full of risks and challenges.
“Our journey” documentary will be held December 24 – the 26th in the Central Radio and Television CCTV-9 record channel 20:00 prime time heavy launch a new media center video, CCTV and other platforms will also be broadcast simultaneously.
中国空间站 On currently on 24th to 26th December 2021 Christmas eve, CNSA –China National Space Administrationin collaboration with CCTV9 China Central Radio and Television will telecast “Our Journey” is the first panoramic documentary produced by China National Space Administration and China Central Radio and Television in 4 years to show the complete course of China’s lunar exploration project in 17 years . It is a documentary . Documentary works with international vision, international expression, and international standards are excellent works that tell Chinese stories, spread space culture, and popularize space knowledge
The documentary consists of three episodes, each of 50 minutes, which truly presents the development of China’s lunar exploration project over the past 17 years, which has been through ups and downs, and left a tortuous but full history. This imprint records not only a huge and complicated super project, but also a testimony to the rapid growth of China’s aerospace industry and the common progress of the Chinese nation. The film fully and vividly interprets the spirit of lunar exploration of “chasing dreams, exploring courageously, coordinating fortifications, and win-win cooperation” , promotes the spiritual pedigree of the Chinese Communists , and conveys the spiritual power that China’s scientific and technological development and progress rely on.
Through character interviews, important development scenarios, and the combined application of various methods such as related materials, the film outlines the continuous and staggered cooperation and support between the various development units of the major systems, and demonstrates the Chinese people’s fearlessness in scientific exploration. Pursuit, as well as the admirable courage and wisdom devoted to this journey full of risks and challenges.
“Our journey” documentary will be held December 24 – the 26th in the Central Radio and Television CCTV-9 record channel 20:00 prime time heavy launch a new media center video, CCTV and other platforms will also be broadcast simultaneously.
八年前的今天，嫦娥三号成功落月！Today, 8 years ago, Chang’e-3 successfully landed on the moon!
As of Month of December 2021, The CNSA –China National Space AdministrationCLEP- China Lunar Exploration Program Belt and Road Initiative Lunar Mission……Chang’e-4with Yutu One the Lunar rover Today in 15th December on 14th December 2013 in which is on eight years ago 2013 the CNSA CLEP China National Space Administration – China Luna Exploration Program Chang’e-3 probe successfully landed on the moon China- People’s Republic of China becomes the third country in the world A country capable of independently implementing a soft landing on the moon on Sinus Iridium Nearby Mare Imbrium ….
8 years ago Chang’e-3 makes the five-star red flag China’s Flag debut on the moon on that day Review looking through back in time eight years ago on The historical moment of the successful landing of Chang’e-3 Lunar Lander.. landing on the The landing site of China’s first Moon lander Chang’e-3 has been named “Guang Han Gong（广寒宫） (Guang: widely, extensively; Han: cold, freezing；Gong: Palace) ” or “Moon Palace” by the International Astronomical Union (IAU), China’s State Administration of Science, Technology and Industry for National Defense (SASTIND). Three nearby impact craters were given the names Zi Wei, Tian Shi and Tai Wei, three constellations in traditional Chinese astrology
On December 14, 2013, China’s first unmanned moon landing probe, Chang’e-3, successfully landed on the moon. The setting moon starts at an altitude of 15 kilometers. During the 11-minute setting of the moon, Chang’e-3 relied on autonomous control to go through six stages: main deceleration, rapid adjustment, approach, hovering, obstacle avoidance, and slow descent. 1.7 kilometers per second gradually reduced to 0. At an altitude of 100 meters from the lunar surface, the probe stopped temporarily and used sensors to observe the landing area to avoid obstacles and select a landing site. After walking the last few meters in free fall, the four landing legs that steadily “stand” on the surface of the moon touched the moon, indicating that Chang’e-3 landed perfectly in the Hongwan area of the moon.
The landing site of Chang’e-3 has good communications and sunshine conditions in the Hongwan area of the moon, and the terrain is relatively flat. No human probe has ever visited before. This area, later named “Guanghan Palace” by the International Astronomical Union, is not only the landing site of Chang’e-3, but also a new starting point for China’s lunar exploration.
While achieving a soft landing on the moon, Chang’e-3 also shoulders the mission of breaking through key technologies such as automatic patrol surveys, deep space measurement and control communications, and moon night survival. The Chang’e-3 lunar probe consisting of the lander and the “Yutu” lunar rover has a total weight of nearly 3.8 tons. In the following time, the “Yutu” left the lander and began scientific exploration, and the lander conducted in-situ detection at the landing site.
Chang’e-3 did not live up to high expectations. It saw the earth on the moon for the first time, obtained images of the earth’s plasma layer for the first time, and completed the first geological profile of the moon and the first celestial body survey. With the successful completion of the mission of Chang’e-3, China’s three-step strategy of “orbiting, landing, and returning” for China’s lunar exploration project has progressed smoothly, and has begun to fully enter a new stage of unmanned automatic sampling and return.
One year ago today 24th November 2020 Now it’s the 24th November 2021 , the Chang Zheng – Long March Five Carrier Rocket Launched away in CNSA – China National Space Administration China Wenchang spaceport launch, Change Five Lunar probe into orbit, opened up towards China – People’s Republic of China’s first celestial bodies sample return trip from Mons Rumker on the Lunar Surface.……
At 23:10 on December 3, 2020, the Chang’e-5 ascender carried a lunar sample to take off from the lunar surface. About 6 minutes later, it entered an elliptical orbit around the moon. At 2:13 on December 6, the ascender accurately reached the scheduled “handover” position 50 kilometers in front of the orbit-return assembly and about 10 kilometers above it. At 5:42, the ascender and the orbit-returning assembly completed the rendezvous and docking. At 6 o’clock, the sample packaging container was transferred from the ascender to the returner. This process of autonomous rendezvous and docking and sample transfer is like the handover process in a 100-meter relay race. It is brilliant and highly technical. Using a lunar orbital rendezvous and docking after take-off from the lunar surface, rather than a direct lunar-to-ground transfer after taking off from the lunar surface, this design is conducive to collecting and carrying more samples back to the earth, and for technical accumulation and verification for subsequent missions.
Aspect 1-chase in space
Both the ascender and the orbit-back assembly fly around the moon, but the orbital heights are different. The ascender runs on the outer track at a height of 210 kilometers, and the orbit-back assembly runs on the inner track at a height of 200 kilometers. The distance on the inner track is short, the track-back assembly runs slightly faster, and the ascender on the outer track runs slower. In order to realize the “transfer bar”, the rail-back assembly needs to raise the rail in the height direction and gradually approach the ascender in the front and rear direction. When approaching a certain distance, the orbit-back assembly will autonomously control the engine to change the direction of travel and take a shortcut to catch up with the ascender. During the entire chase process, multiple anchor points are set up, and the orbit-return assembly stops to keep the relative position unchanged, conducts a state inspection, and ensures that the measurement and control conditions meet the requirements during docking.
Picture: Lunar orbital rendezvous and docking flight phase division. (Source: Xu Yang, Ma Lin, Liu Tao, etc. Chang’e 5 Lunar Orbital Rendezvous and Docking Guidance, Navigation and Control System. Science in China: Technological Sciences, 2021, 51: 788–798)
Aspect 2-“High-precision measurement” + “Know yourself and the enemy”
During the rendezvous and docking process, it is necessary to make the orbit-return assembly and the ascender know the relative position, speed and attitude of each other. For this reason, a variety of sensors for relative measurement are configured to realize relative navigation. When the distance is 100 kilometers, the microwave radar starts to work. It not only provides the relative motion parameters of the two devices according to the traditional radar “call and answer” mode, but also upgrades to the “dialogue exchange” mode, between the orbital assembly and the ascender. Two-way transmission of remote control commands and telemetry parameters. At a distance of 20 kilometers, lidar “comes on the scene” to provide higher-precision measurement information. At about 100 meters, the optical sensor began to show its talents to achieve close distance and attitude measurement. These sensors are relayed to each other over the working distance and covered and connected, so as to ensure that there are at least two different systems of sensors available at any distance, so that the orbit-back assembly can be seen more accurately, the measurement is more precise, and the system is more reliable.
Aspect 3-precise “handover baton” from 380,000 kilometers away
The weight of the orbit-return assembly is more than 2 tons, but the mass of the ascender is only one-sixth of its mass. If the traditional collision docking is used, it is very easy to cause the ascender to be knocked into flight. For this reason, a claw-type catching and docking mechanism is specially designed. Each pair of claws is like two arms, which are quickly closed within 1 second to form a closed space, and the passive lock handle of the ascender is firmly restrained inside. Can’t escape. It has to be accurate, and the accuracy requirement after docking is better than 0.5 mm, which is like “threading a needle” in space. The use of 3 sets of claw mechanism star-shaped circumferential layout and self-centering design realizes the automatic centering of the two aircraft after docking, and realizes the lightweight design while ensuring high-precision docking.
The design of the transfer mechanism is also very clever. In order to realize the transfer of long-stroke sample containers of more than six hundred millimeters, the designers found inspiration from the inchworm. Based on the principle of movement stroke amplification + relay transfer, they proposed a relay mechanism for imitating the inchworm. The simple circular expansion and contraction movement of the parallel link can realize the continuous movement of the object. The entire transfer process is like the movement of a caterpillar, stretching and shrinking, continuously advancing.
As of Month of December 2021, The CNSA –China National Space AdministrationCLEP- China Lunar Exploration Program Belt and Road Initiative Lunar Mission……Chang’e-4 with Yutu two the Lunar rover still working exploring more than 839.37 meters on the other side of the moon on the 103 Kilometers Diameter Von Karman Crater in which is least than two length by length fifty five Kilometers Hong Kong –Macau- Zhuhai Bridges …. Working Exploring the Crater on the other side of the Moon Chang’e Luna….
Recently, the National Space Science Center, Chinese Academy of Space Weather Liu Yang State Key Laboratory researcher team, joint University of Hawaii, Macau University of Science and Technology, Peking University and Hong Kong Polytechnic University and other domestic and foreign partners to acquire based on Chang E IV Patroller has Ultra-high spatial resolution imagery and spectral data have identified carbonaceous chondrite impactor residues that are less than one million years old in situ on the lunar surface for the first time. The research results are titled “Impact remnants rich in carbonaceous chondrites detected on the Moonby the Chang’e-4 rover” and published in “Nature- Astronomy.
On the ninth day of Chang’e 4 on the far side of the moon, the Yutu-2 lunar rover “ran into” a fresh impact crater with a size of 2 meters, and carried out detailed spectral detection of the impact crater (Figure 1). The detailed analysis of the hyperspectral image data obtained by the imaging spectrometer found that the spectra of the suspected “residue” in the center of the impact crater and the typical lunar soil and rock fragments inside and outside the crater show significantly different characteristics, which are similar to the spectrum of carbonaceous meteorites. Very high degree of similarity. Quantitative inversion results of the spectrum based on the radiation transfer model showed that the mass ratio of the carbonaceous meteorite in the residue reached more than 40%. The results of the numerical simulation of the impact crater show that a 15cm diameter loose impactor hitting the lunar surface at a speed of 15km/s (the typical impactor speed of the lunar surface) can form the small impact crater morphology observed above. And there are residues distributed in the center of the impact crater.
The study of impact residues will provide an important reference for the origin of lunar water and the evolution history of the composition and type of impact bodies in the Earth-Moon system. It is also expected to further constrain the evolution of the solar system’s orbital dynamics and enhance our understanding of the impact history of the inner solar system.
Studies have shown that the impact of carbonaceous asteroids rich in volatile matter may still provide water for the current moon, and it is believed that carbonaceous asteroids may be a common type of impactor in the current Earth-Moon system, supporting the type of impactor in the inner solar system from early The main change from ordinary chondrites to later carbonaceous chondrites. By analyzing possible impactor residues in the young moon samples of Chang’e-5, further scientific verification can be carried out.
Source: Researcher Liu Yang’s team at the State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences
