Can Lunar Soil Hold Up a Moon Base?

If humans one day build houses on the Moon, will the lunar soil underfoot hold up? And how does it differ from foundation materials on Earth? A team of Chinese researchers is answering those questions by probing some of the rarest material on the planet — or off it.

Scientists at the Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS), led by doctoral student Qiao Sijia and researcher Li Lihui, applied mineral identification and nanoindentation techniques to tiny samples of Chang’e-5 lunar soil (designated CE5-054), a lunar meteorite (NWA-4734), and a terrestrial rock sample (CR-1), according to Xinhua News. Their findings reveal sharp differences in how individual minerals resist deformation — and show how space weathering reshapes the mechanical properties of the Moon’s surface material.

The results carry direct engineering implications for building lunar bases from in-situ resources rather than hauling materials from Earth.

A Delicate Test on Precious Samples

Moon samples are extraordinarily scarce, so researchers need methods that leave them largely intact. Nanoindentation fits the bill: as the team explained, the technique presses an ultra-fine probe — measuring just hundreds of nanometers — gently into a material surface, recording how far it sinks and how much it rebounds. From those measurements, scientists can infer mechanical properties with minimal damage.

The tests yield two key metrics. The elastic modulus reflects a material’s resistance to deformation in the elastic stage: the higher the value, the harder it is to stretch or compress. Hardness describes resistance to indentation or wear: the higher the value, the tougher and more abrasion-resistant the material.

In the Chang’e-5 soil, elastic modulus varied widely across minerals, following the order olivine > pyroxene > ilmenite > spinel > plagioclase, with plagioclase notably softer. The researchers reported a median elastic modulus range of roughly 87.1 to 173.2 GPa for the lunar soil minerals. Hardness differences, by contrast, were far smaller — pyroxene slightly harder, ilmenite slightly softer, and the rest largely similar.

Same Mineral, Different Behavior

Perhaps the most striking finding is that the same mineral behaves differently depending on where it formed. Comparing pyroxene, olivine, and plagioclase from Earth, the Moon, and a meteorite, the team found that origin matters as much as type.

The terrestrial rock (CR-1) was stiffest and hardest overall, having escaped weathering almost entirely. The lunar meteorite (NWA-4734) produced the lowest elastic modulus in pyroxene and olivine — yet its plagioclase showed the highest. The Chang’e-5 soil and the lunar meteorite had comparable mineral hardness, overlapping within the margin of error.

The explanation lies in what the researchers call a mineral’s “life experience.” Its resistance depends not only on its “genes” — mineral type and crystal structure — but also on structural defects accumulated through weathering, such as microcracks, pores, and lattice dislocations. These defects are random and unevenly distributed, which is precisely why identical minerals can diverge so dramatically in performance.

How Space Weathering Changes the Rules

Space weathering played a decisive role, the study found. The lunar meteorite (NWA-4734) endured high-temperature, high-pressure impact events that seeded it with microcracks and other structural flaws, weakening its overall mechanical performance. Its plagioclase, which has a lower melting point and is prone to phase changes, may have locally densified during impact — explaining why it ended up with a higher elastic modulus despite the broader damage.

The Chang’e-5 soil, by contrast, experienced no large high-energy impacts. Solar wind and micrometeorite melting or fracturing were confined mostly to particle surfaces, leaving the overall structure relatively intact — and mechanically superior to the meteorite. The terrestrial rock (CR-1), untouched by weathering, preserved its original structure and proved hardest and most resistant to deformation.

“The above results provide valuable key parameters for future numerical simulation using lunar soil, development of high-fidelity lunar soil simulants, and even the realization of in-situ resource utilization on the Moon,” the researchers wrote. The work offers micro-mechanical evidence for understanding weathering on Moon-like bodies — a foundation for anyone planning to build there.

From Sample to Structure

That matter extends well beyond the laboratory. China’s International Lunar Research Station (ILRS), proposed in 2016 and nicknamed the “Guanghan Palace” project, aims to assemble a long-term research facility on the Moon — a basic configuration before 2035 and an expanded version before 2045. Part of the plan hinges on “using local materials”: turning lunar soil into building material and tapping lunar water ice for life support.

A device called the “lunar soil in-situ 3D printing system,” developed by the Deep Space Exploration Laboratory, is central to that vision. Yang Honglun, the system’s technical lead, told the Global Times that the machine uses concentrated solar energy — roughly 3,000 times ambient sunlight, channeled through fiber-optic bundles — to heat lunar soil above 1,300°C and melt it into bricks. Lunar soil is the only raw material, requiring no additives from Earth. The flexible fiber bundles can also be redirected to print arbitrary shapes, not just bricks.

The resulting “lunar soil bricks” offer high strength and good thermal insulation, suitable for roads, equipment platforms, and buildings. But the challenges are formidable: lunar soil has low thermal conductivity, a high melting point, and a complex mineral composition, making it hard to heat uniformly and prone to cracks and voids. Sustaining energy transmission through the harsh lunar environment — low solar elevation, high vacuum, extreme cold — remains difficult.

Water extraction follows a parallel track. Researchers at the Deep Space Exploration Laboratory, working with institutions including Harbin Institute of Technology, developed China’s first prototype of a “multi-needle lunar soil water-ice thermal extraction system,” which drills spiral needles into ice-bearing regolith and heats it to release water vapor for collection. Lunar water ice could support drinking water and oxygen, and be electrolyzed into hydrogen-oxygen fuel — reducing the cost and risk of hauling supplies from Earth.

Why It Matters

China’s lunar ambitions come with a timeline. Wu Weiren, chief designer of the country’s lunar exploration program, has outlined a three-step strategy for deep-space resource development: build exploration capacity and run in-situ utilization experiments before 2030, achieve small-scale lunar development before 2040, and gain initial large-scale capability before 2050. Chang’e-7 is set to travel to the lunar south pole in search of water ice, while Chang’e-8, planned for around 2028, will verify surface resource-utilization technologies including lunar soil oxygen production and 3D-printed bricks. Together they are intended to form the basic configuration of the research station — with 17 countries and international organizations and more than 60 research institutions already signed on to the ILRS cooperation.

The mechanical data from Chang’e-5 feeds directly into that effort. Numerical simulations and high-fidelity simulants depend on knowing how real lunar soil minerals behave under stress — and, crucially, on understanding that a single mineral’s behavior can shift depending on its history. As engineering moves from concept to construction, the difference between olivine and plagioclase, or between a weathered meteorite and a protected sample, may decide what stands on the lunar surface.

The next milestones will test whether that laboratory knowledge can survive contact with the Moon itself.