As of 26 August 2020, The CNSA –China National Space Administration Belt and Road Initiative Lunar Mission on the One Hundred Kilometre diameter Von Karman Crater Chang’e 4 lander and the “Yutu 2” lunar rover the Chang’e-4 lander and the “Yutu-2” lunar rover have completed 21-month scientific exploration on the back of the moon. They broke through 600 days on August 25 and the rover travelled 519.29 meters. The scientific research team uses the data returned by the scientific payload to carry out a large number of studies and obtain many scientific results.
- Research on the morphology and mineral composition of the inspection area on the back of the moon. Using the visible and near-infrared spectrometer, panoramic camera and lunar radar data carried by the “Yutu-2” lunar rover, analyse the spectrum, rock distribution, and shallow structure of the landing area to obtain the morphology of the landing area and the composition of the material and minerals. , Source and characteristics of scientific conclusions. It is the first time to directly obtain the composition of the deep lunar material through in-situ exploration, revealing the complex impact history of the back of the moon, especially the Aitken Basin in Antarctica, providing key evidence for the formation and evolution of the lunar soil, and selecting sites for future Antarctic landings and inspections. Provide important reference.
- Research on the superficial structure of the moon’s surface in the inspection area on the back of the moon. Based on the lunar measuring radar and camera data of the Chang’e-4 lander and other multi-source data, research and establish the relationship between the formation profile of the Chang’e-4 landing area and the multi-phase sputter coverage. The accumulated thickness of the sputters in the landing area is about 70 meters, and the surface is the spatter of the Finsen impact crater; within the depth of the inspection area of 40 meters, there are 3 different stratigraphic units, including the fine-grained lunar soil layer within 12 meters, 12 24 meters of gravel layer and 24 meters to 40 meters of sputter deposition and weathering product layer. These results reveal for the first time the mystery of the underground structure on the back of the moon, greatly improving our understanding of the history of lunar impact and volcanic activity, and bringing new enlightenment to the study of geological evolution on the back of the moon.
- Lunar surface neutron and radiation dose, neutral atom research. Using the detection data of the Lunar Surface Neutron and Radiation Dose Detector and the Neutral Atom Detector of the Chang’e-4 lander, the environmental spectrum of high-energy particles on the lunar surface, the energy spectrum structure and albedo of the neutral atom on the lunar surface are obtained. The neutron radiation dose rate on the moon surface is 1-2 times higher than that inside the space station, and the radiation dose equivalent is about 1 times higher. It is confirmed that the primary galactic cosmic rays hit the surface of the moon, producing albedo protons (first discovered on the US Lunar Orbiter, this time it was verified on the moon surface). These results provide important support for conducting research on the microscopic interaction between the solar wind and the lunar surface, promote the understanding of lunar surface radiation risks, and provide an important reference for future lunar astronauts’ lunar surface radiation hazards estimation and radiation protection design.
- Moon-based low-frequency radio astronomy observation and research. Using the low-frequency radio spectrometer on the Chang’e-4 lander platform, the first successful low-frequency radio astronomical observation on the back of the moon was carried out, and a large amount of effective observation data was obtained. The preliminary acquisition of the electromagnetic environment background frequency spectrum and low-frequency radio three-component time-varying waveform data of the lunar landing zone below the frequency of 40MHz has important scientific significance for the study of solar low-frequency radio characteristics and the low-frequency radio environment of the moon surface.
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