Shulou(Shulou.com)11/24 Report--

CTOnews.com, Sept. 12 (Xinhua) due to the lack of direct sample analysis evidence, the cause and distribution of lunar surface water have been controversial.

According to a CCTV report, the research team of the Institute of Geochemistry of the Chinese Academy of Sciences conducted a study on the lunar soil samples brought back by Chang'e-5. Infrared spectroscopy and nano-ion probe analysis showed that there was a large amount of solar wind-derived water in the mineral surface, and it was estimated that the amount of water contributed by solar wind proton injection to Chang'e-5 lunar soil was at least 170ppm.

Combined with transmission electron microscopy and energy spectrum analysis, it is revealed that the formation and preservation of solar eolian water are mainly affected by the exposure time, crystal structure and composition of minerals. This study confirms that lunar surface minerals are an important "reservoir" of water, which provides an important reference for the distribution of water in the middle latitudes of the lunar surface.

CTOnews.com learned that this result was recently published in the international academic journal Nature Letters, article No. 5336 (2022).

Abstract of the thesis:

The formation and distribution of lunar surface water is still unclear. Here, we show that the uppermost surfaces of olivine, plagioclase and pyroxene particles in the Chang'e 5 sample are protruding due to solar wind implanted water (OH / H2O). The results of spectral and microstructure analysis show that the water implanted by solar wind is affected by exposure time, crystal structure and mineral composition. We estimate that there is at least 170ppm water content in the lunar soil in the Chang'e-5 area, which is consistent with the water content reported by the lunar mineralogical plotter and the Chang'e-5 lander. Through the comparison with remote sensing data and the analysis of lunar soil maturity, the water volume of Chang'e-5 provides a reference for the distribution of surface water in the mid-latitudes of the moon. We conclude that the minerals in the lunar soil are important reservoirs and that the formation and retention of water derived from the solar wind occurs on airless celestial bodies.

According to reports, the CE5 mission recovered 1.731 kilograms of lunar surface material from the Procellarum basin in the northeast of the moon (43.06N, 51.92W). The latitude of the basin is higher than that explored by all previous sampling missions. Radiometric dating using lead-lead (Pb-Pb) isotope isochrons shows that the return sample is 2030 ±4 million years old, which is much younger than the lunar samples collected by the Apollo and lunar missions.

Lunar soil contains water from three sources: the interior of the moon, the solar wind, comets and meteoroids. Considering that such samples are exposed to the lunar surface, lunar particles are expected to record the information injected by solar wind and form solar eolian water, which is expected to provide a reference for the preservation and distribution of lunar surface water.

"the New Achievement of Chang'e V: there is primary water from the interior of the moon in the lunar soil."

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