Chinese Researchers Devise New Strategy for Producing Water on the Moon

The strategy for in-situ water production on the Moon through the reaction between lunar regolith and endogenous hydrogen. Credit: NIMTE)

In the coming years, China and Roscosmos plan to create the International Lunar Research PStation (ILRSP), a permanent base in the Moon’s southern polar region. Construction of the base will begin with the delivery of the first surface elements by 2030 and is expected to last until about 2040. This base will rival NASA’s Artemis Program, which will include the creation of the Lunar Gateway in orbit around the Moon and the various surface elements that make up the Artemis Base Camp. In addition to the cost of building these facilities, there are many considerable challenges that need to be addressed first.

Crews operating on the lunar surface for extended periods will require regular shipments of supplies. Unlike the International Space Station, which can be resupplied in a matter of hours, sending resupply spacecraft to the Moon will take about three days. As a result, NASA, China, and other space agencies are developing methods to harvest resources directly from the lunar environment – a process known as In-Situ Resource Utilization (ISRU). In a recent paper, a research team with the Chinese Academy of Sciences (CAS) announced a new method for producing massive amounts of water through a reaction between lunar regolith and endogenous hydrogen.

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NASA is Looking for a Commercial Partner to Save VIPER

NASA VIPER rover in clean room
NASA’s VIPER rover sits assembled inside the clean room at the agency’s Johnson Space Center in Texas. (Credit: NASA)

Space exploration has led the world in that wonderful human ability to co-operate, alas history shows we don’t do it quite as much as we should! Recently NASA has put a request out to the wider community for ideas for their VIPER rover which was designed for lunar exploration. The exact purpose of VIPER was to hunt for volatile minerals in the polar regions of the Moon. The big question, will NASA get any takers?

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Making Rocket Fuel Out of Lunar Regolith

An illustration of a Moon base that could be built using 3D printing and ISRU, In-Situ Resource Utilization. Credit: RegoLight, visualisation: Liquifer Systems Group, 2018
An illustration of a Moon base that could be built using 3D printing and ISRU, In-Situ Resource Utilization. Credit: RegoLight, visualisation: Liquifer Systems Group, 2018

In the coming years, NASA and other space agencies plan to extend the reach of human exploration. This will include creating infrastructure on the Moon that will allow for crewed missions on a regular basis. This infrastructure will allow NASA and its international partners to make the next great leap by sending crewed missions to Mars (by 2039 at the earliest). Having missions operate this far from Earth for extended periods means that opportunities for resupply will be few and far between. As a result, crews will need to rely on In-Situ Resource Utilization (ISRU), where local resources are leveraged to provide for basic needs.

In addition to air, water, and building materials, the ability to create propellant from local resources is essential. According to current mission architectures, this would consist of harvesting water ice in the polar regions and breaking it down to create liquid oxygen (LOX) and liquid hydrogen (LH2). However, according to a new study led by engineers from McGill University, rocket propellant could be fashioned from lunar regolith as well. Their findings could present new opportunities for future missions to the Moon, which would no longer be restricted to the polar regions.

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The Moon's Southern Ice is Relatively Young

Elevation data of the Moon showing the South Pole-Aitken Basin. Credit: NASA/GSFC/University of Arizona
Elevation data of the Moon showing the South Pole-Aitken Basin. Credit: NASA/GSFC/University of Arizona

Around the Moon’s southern polar region lies the South Pole-Aitken Basin, the single-largest impact basin on the lunar surface. Within this basin, there are numerous permanently shadowed regions (PSRs) that are thought to have trapped water ice over time. These deposits are crucial to future missions like the Artemis Program that will lead to the creation of permanent infrastructure. This water ice will supply crews with a steady source of water for drinking and irrigation and the means for chemically producing oxygen gas and rocket fuel.

For scientists, these PSRs are believed to have emerged when the Moon began migrating away from Earth roughly 2.5 billion years ago. Over time, these regions acted as “cold sinks” and trapped water ice that existed on the lunar surface at the time. However, according to a recent study led by the Planetary Science Institute (PSI), the Moon’s permanently shadowed areas arose less than 2.2 billion years ago and trapped ice even more recently than that. These findings could significantly impact future crewed missions as they indicate that the water ice found in lunar craters could be of more recent origin.

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The Solar Wind is Creating Water on the Surface of the Moon

Water on the Moon has been a hot topic in the research world lately. Since its first unambiguous discovery back in 2008. Since then, findings of it have ramped up, with relatively high concentration levels being discovered, especially near the polar regions, particularly in areas constantly shrouded in shadow. Chang’e 5, China’s recent sample return mission, didn’t land in one of those permanently shadowed areas. Still, it did return soil samples that were at a much higher latitude than any that had been previously collected. Now, a new study shows that those soil samples contain water and that the Sun’s solar wind directly impacted that water.

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The Moon Could Have Gathered Some of its Water from the Earth’s Atmosphere

Our Moon is a fascinating world that has captivated us since time immemorial. Long before the first telescope was invented, ancient humans used the Moon as a calendar in the sky, with evidence that lunar timekeeping was around as early as 25,000, 30,000, and even 35,000 years before the present. Long before humanity had written language, lived in organized cities, and worshipped structured religions, the Moon was one of humanity’s first timepieces. It wasn’t until the telescope was invented that our Moon became an object of scientific curiosity, with the sketches by Galileo Galilei giving us a new perspective on our nearest celestial neighbor. As science advanced, so did our understanding of the Moon. While the Apollo missions were successful in teaching us about the geology of the Moon, it wasn’t until 2009 when the LCROSS impact probe onboard the Lunar Reconnaissance Orbiter deliberately crashed into a dark crater on the Moon’s south pole and detected 155 kilograms of water as it flew through the ejecta plume before ultimately crashing into the lunar surface.

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China’s Lunar Lander Finds Water Under its Feet

The area marked by the red line are the scoop sampling points, the blue box identifies the imaging area of the panoramic camera and the base image is from landing camera. Credit: Chinese Academy of Sciences.

Earlier this year, scientists from China’s Chang’E-5 lunar lander revealed they had found evidence of water in the form of hydroxyl from in-situ measurements taken while lander was on the Moon. Now, they have confirmed the finding with laboratory analysis of the lunar samples from Chang’E-5 that were returned to Earth.  The amount of water detected varied across the randomly chosen samples taken from around the base of the lander, from 0 to 180 parts per million (ppm), mean value of 28.5?ppm, which is on the weak end of lunar hydration.

“For the first time in the world, the results of laboratory analysis of lunar return samples and spectral data from in-situ lunar surface surveys were used jointly to examine the presence, form and amount of ‘water’ in lunar samples,” said co-author Li Chunlai from the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), in a press release. “The results accurately answer the question of the distribution characteristics and source of water in the Chang’E-5 landing zone and provide a ground truth for the interpretation and estimation of water signals in remote sensing survey data.”

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The Moon’s Ancient Volcanoes Could Have Created Ice Sheets Dozens of Meters Thick

Everyone loves looking at the Moon, especially through a telescope. To see those dark and light patches scattered across its surface brings about a sense of awe and wonder to anyone who looks up at the night sky. While our Moon might be geologically dead today, it was much more active billions of years ago when it first formed as hot lava blanketed hundreds of thousands of square kilometers of the Moon’s surface in hot lava. These lava flows are responsible for the dark patches we see when we look at the Moon, which are called mare, translated as “seas”, and are remnants of a far more active past.

In a recent study published in The Planetary Science Journal, research from University of Colorado Boulder (CU Boulder) suggests that volcanoes active billions of years ago may have left another lasting impact on the lunar surface: sheets of ice that dot the Moon’s poles and, in some places, could measure dozens or even hundreds of meters (or feet) thick.

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One Crater on the Moon is Filled with Ice and Gas that Came from a Comet Impact

In the coming years, NASA and other space agencies hope to explore the southern polar region of the Moon. Recent surveys of this region have revealed an environment rich in volatiles – elements that vaporize rapidly due to changes in conditions. In particular, missions like NASA’s Lunar Reconnaissance Orbiter (LRO) and the Lunar CRater Observation and Sensing Satellite (LCROSS) have detected abundant water ice in the permanently-shadowed craters around the South Pole-Aitken Basin.

Where this water came from has remained the subject of much debate, with theories ranging from it being deposited by volcanic activity or solar wind to being delivered by comets. After examining LCROSS data on the Cabeus crater near the Moon’s south pole, a multinational team of researchers from the U.S. and France determined that the water ice and volatiles in the crater were likely delivered by the impactor (a comet) that created it.

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China’s Lander Has Detected Water on the Moon

Illustration: Chang'e-5 probe
An artist's concept shows the Chang'e-5 lander and ascent vehicle on the Moon. (CNSA / CLEP via NASA)

China’s Chang’e-5 lunar lander has found evidence of hydroxyl (OH) on the Moon. Hydroxyl is a close chemical cousin of water, H2O. While several other orbital missions have detected OH on the Moon previously, Chang’e-5 marks the first time it has been detected by a spacecraft sitting on the lunar surface.

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