The new achievement of Chang'e 5 reveals the distribution characteristics of the moon table water in the landing area

On June 15, 2022, Beijing time, "Nature Communications" released an important research result of the Chang'e 5 in my country online. The team led by the National Observatory of the Chinese Academy of Sciences Li Chunlai, Researcher Liu Jianjun, and Researcher Shu Rong, a research Institute of Technology Physics, and the Institute of Geological Earth, Institute of Physics, Xi'an Optical Machinery, Geochemical Institute of the Chinese Academy of Sciences, the General Design Department of Beijing Space Aircraft, Beijing Aerospace Flight Flight Control Center, Beijing Space Electrical Research Institute and other units cooperated to the first international laboratory analysis results and spectral data of the monthly table detection of lunar samples. The distribution characteristics and sources of water in Chang'e -5 landing area provides the real value of the ground for the transliteration and estimation of the signal in the remote sensing data detection data.

Is there a lot of controversy in the moon, how much water, what form of water, and where water comes from, and it has always been a hot spot in the research of the moon science. At the beginning of the Chang'e -5 mission, the research team proposed that the scope of the moon mineral spectrum analyzer on the lander expanded to 3.2 μm, and realized the first international detection of the first monthly watershed water spectrum absorption characteristics. In order to avoid the impact of the dynamic "water" (hydroxyl OH) when the engine feathers and solar wind bombardment of the moon meter, the research team carefully designed the timing of the obtaining position detection spectrum data. The detection timing is selected to avoid the effect of the engine feather composition when the CE-5 detector is landing after landing; the detection time selects the highest temperature (approximately 62 ~ 87 degrees Celsius) at noon at noon. The dynamic "water" of the moon watch; the moon (landing area) during spectral measurement is in the protection of the earth's magnetic field, blocking the solar wind and avoiding the dynamic "water" (hydroxy Oh) factors generated by the solar wind bombardment. In this environment, the Chang'e -5 spectrometer can obtain the "clean" "water" absorption of the spectrum. After strict correction and analysis, the research team found that the moon soil in Chang'e 5 is obviously contained in the "water" in the form of hydroxyl. But the average content is low, only about 30ppm.

At present, there are three main possibilities for the source of the moon "water": first, the (dynamic) hydroxyl substances produced by the interaction of solar wind particles and moon surface substances; the other is the water and hydroxy content brought by the comets or meteorites that hit the moon; Moon native (internal) water. After the lunar sample returned to the earth, the research team conducted a systematic analysis of the backing of the lunar sample in the laboratory. The laboratory spectrum analysis once again verified the clear existence of hydroxy water, but the study of the existence of "water" requires detailed research on the study of the existence of water. Analysis of mineral rock science. The Apollo Moon Sample Study believes that the glue glass (impact) glue glass contains the hydroxyl substance formed by the sun wind for a long time. The content of the glue glass is an important factor affecting the "water" content in the moon sample. The laboratory analysis of returning samples shows that the Chang'e -5 moon sample is a type of young basalt, with fewer glue glass content (less than 16%). It is only 1/3 of the Apollo November sample. There are not more than 18 ppm from the solar wind injection glass into the glass. At the same time, Chang'e -5 landing area Moon -soil samples are very low, and their contributions to "water" can be ignored. Therefore, there must be native water from the moon in Chang'e 5. Analysis of the laboratory of Chang'e 5 Moon Sample, at least one aquatic mineral -hydroxylhhelite was found, and its content was uneven. There is a "water" from the process of crystalline crystallization in Chang'e 5, which shows that "water" not only exists during the late moon magma activity, but also may play a very important role.

The monthly detection spectrum data of this research results is obtained by the moon mineral spectrum analyzer developed by the Institute of Technology and Physics of the Chinese Academy of Sciences. Scientific detection of load operation management, data receiving and processing by the National Observatory of the Chinese Academy of Sciences (the ground application system of the lunar exploration engineering) Finish. The study was funded by the third phase of the National Science and Technology Special Lunar Exploration Project and the key deployment project of the Chinese Academy of Sciences "Comprehensive Research on the Chang'e 5 Moon Sample".

Source: CCTV News Client

- END -