From U.S. Naval Research Laboratory 24/11/23

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U.S. Naval Research Laboratory (NRL) researchers have discovered solar-wind hydrogen in lunar samples, which indicates that water on the surface of the Moon may provide a vital resource for future lunar bases and longer-range space exploration.

Space-based resource identification is a key factor in planning for civilian- and government-led space exploration.

“Hydrogen has the potential to be a resource that can be used directly on the lunar surface when there are more regular or permanent installations there,” said Dr. Katherine D. Burgess, geologist in NRL’s Materials Science and Technology Division.

“Locating resources and understanding how to collect them prior to getting to the Moon is going to be incredibly valuable for space exploration.”

Lunar samples analyzed in this study. a SEM image of apatite particle mounted in epoxy. The sample surface has a number of adhered grains and apparent melt splashes. b SEM image of thinned FIB section extracted from location of yellow box in (a) showing multiple surfaces of grain available for study of space weathering features. c SEM image of dirt pile showing location of extracted slice. d SEM image of FIB section that includes a merrillite grain along with several other soil particles. Credit: Communications Earth & Environment

The Apollo lunar soil samples were provided by a NASA-funded research mission to NRL scientists for investigation and testing.

The research team, led by scientists in NRL’s Materials Science and Technology Division, continues to study lunar surface and asteroidal samples to gain understanding of how surfaces interact with the space environment, which is known as space weathering.

Merrillite grain adhered to agglutinic glass. a, b HAADF image and EDS map of grain adhered to npFe0-rich agglutinitic glass. c HAADF image from box marked in (a) showing the vesicular space weathered rim of the merrillite. The rim of the glass has abundant 1–5 nm npFe0. d Low-loss EELS spectra extracted from vesicles (1-green dashed line; 2-red solid line) and surrounding material (blue solid line). Several vesicles show clear peaks at 13 eV indicative of the presence of H-bearing species in the vesicles. Spectra are normalized to value at 20 eV and offset vertically for clarity. Inset shows spectra without offset. Mer = merrillite. Credit: Communications Earth & Environment

Previous testing from additional Apollo samples confirmed location of solar wind helium in lunar soil grains.

“This is the first time scientists have demonstrated detection of hydrogen-bearing species within vesicles in lunar samples,” said Dr. Burgess.

“Previously, the same team at NRL used state-of-the-art techniques such as scanning transmission electron microscopy and electron energy loss spectroscopy to detect helium in lunar samples, and other researchers have found water in other planetary samples, but this is the first publication to show hydrogen in-situ in lunar samples.”

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