As of Month of December 2021, The CNSA –China National Space Administration CLEP- 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