优游娱乐资金千亿担保: China's lunar probe detects in-situ moon surface water

2022-01-09 11:24:47Xinhua Editor : Zhang Mingxin ECNS App Download

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Chinese scientists published results of in-situ detection of water signals on the moon by the Chang'e-5 lunar lander, lending new evidence to the dryness of the satellite.

The study published on Saturday in the peer-reviewed journal Science Advances revealed that the lunar soil at the landing site contains less than 120 ppm water or 120g water per ton, and a light, vesicular rock carries 180 ppm, which are much drier than that on Earth.

A device onboard the lunar lander measured the spectral reflectance of the regolith and the rock and detected water on the spot for the first time.

The water content can be estimated since the water molecule or hydroxyl absorbs at a frequency of about three micrometers, according to researchers from the Chinese Academy of Sciences (CAS).

It was the solar wind that contributed to the most humidity of lunar soil as it brought hydrogen that makes up the water, the researchers said.

The additional 60 ppm water in the rock may originate from the lunar interior, according to the researchers.

Therefore, the rock is estimated to hail from an older, more humid basaltic unit before being ejected onto the landing site to be picked up by the lunar lander.

The study revealed that the moon had turned drier within a certain period, owing probably to the degassing of its mantle reservoir.

The Chang'e-5 spacecraft landed on one of the youngest mare basalts located at a mid-high latitude on the moon. It measured water on the spot and retrieved samples weighing 1,731 grams.

"The returned samples are a mixture of granules both on the surface and beneath," Lin Honglei, a researcher with the Institute of Geology and Geophysics under CAS, told Xinhua. "But an in-situ probe can measure the outermost layer of the lunar surface."

Lin also said that to simulate authentic lunar surface conditions on Earth is challenging, thus making the in-situ measurement so essential.

The results are consistent with a preliminary analysis of the returned Chang'e-5 samples, according to the study.

The findings provide more clues to China's Chang'e-6 and Chang'e-7 missions. The investigations of lunar water reserves come into the limelight as the building of manned lunar stations are in the pipeline in the next decades. 


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