Researchers at The Hong Kong University of Science and Technology have developed a living building material combining sand with gelatin and genetically engineered yeast, designed to undergo natural freeze-drying under the Red Planet’s cold, low-pressure conditions for potential 3D-printed habitats.
Building permanent structures on Mars requires overcoming enormous logistical hurdles. Hauling heavy construction supplies from Earth consumes precious cargo capacity, and the planet’s extreme cold, near-vacuum atmospheric pressure, and heavy radiation make standard terrestrial methods impossible. To bypass these limitations, scientists are exploring construction techniques that rely on materials found directly on the Martian surface.
A study published in the journal Chem Circularity details a novel approach: mixing sand with a specialized biological binder made of gelatin and engineered yeast. When extruded through a 3D printer under Martian conditions, the mixture undergoes a process that turns raw ingredients into a sturdy, lightweight structural shell.
How Freeze-Drying and Mussels Inspired Martian Building Material
The inspiration behind the recipe came from an everyday kitchen phenomenon. Jishen Qiu, an associate professor in civil engineering who served as senior author on the study at The Hong Kong University of Science and Technology, looked to preserve foods for his conceptual breakthrough.
“My inspiration came from freeze-dried fruits that become harder. So I asked myself if we can take advantage of that and make some materials.”
Jishen Qiu, associate professor in civil engineering, via The Hong Kong University of Science and Technology
Mars provides a ready-made environment for this exact process. The planet’s extremely low temperature and pressure mimic industrial freeze-drying. When the wet mixture leaves a printer nozzle in the Martian atmosphere, the water freezes and converts directly from ice into vapor. This sublimation leaves behind microscopic pores, resulting in a foam-like material that is both light and porous.
To create the adhesive binder, the research team genetically engineered the yeast Saccharomyces cerevisiae to display highly adhesive proteins. These included proteins inspired by the ones mussels use to anchor themselves to underwater rocks. Gelatin knits the ingredients together and provides a growth substrate for the cells, while sand supplies mass and structural integrity.
Testing the Strength of Yeast-Based Domes in Simulated Conditions
In laboratory tests, the team subjected their Martian living building material to simulated environments featuring temperatures of –30°C and 0.01 atmospheres of pressure. The resulting prototypes formed small, wine-cork-sized domes standing 45 millimeters tall and 30 millimeters wide.
Measurements revealed that the material achieved a compressive strength of 10 to 12 megapascals, placing it on par with low-grade concrete. Jishen Qiu noted the structural capability of these compositions.
“This is actually strong enough to build a one- or two-story building on Earth whose gravity is three times that of Mars. So, you can probably easily build a multistory building on Mars with the material.”
Jishen Qiu, study author, via Discovermagazine
The material also demonstrated high resistance to bending strain, suggesting it could better withstand strong winds and airborne debris on the Martian surface.
A Closed-Loop Circular Economy for Extraterrestrial Settlers
Traditional proposals for extraterrestrial construction often rely on heating and melting Martian rocks or moon dust into bricks and beams. Those thermal methods demand substantial energy resources, which will be scarce during early missions.
The biological approach offers a path toward a circular economy. Settlers could dismantle structures when no longer needed and recover the living yeast to regrow in bioreactors. As long as a single yeast cell remains viable, the building blocks can be propagated anew, drastically reducing the ongoing need for imported raw materials from Earth.
“As long as there’s one yeast that’s still alive, you can grow them again.”
Jishen Qiu, civil engineer, via Popular Science
Remaining Challenges Before Ground Breaks on Mars
Despite promising laboratory metrics, significant hurdles remain before living building materials see real-world use on another planet. The current prototypes were manufactured using terrestrial sand rather than actual Martian regolith. Because no authentic soil samples have been returned from Mars, researchers rely on geological simulants that cannot fully account for native salts, minerals, or toxic compounds.
Radiation poses another major unanswered question for biological agents operating unprotected on the Martian surface. Additionally, a printed dome of this material would not hold an atmosphere on its own. Population Science and other reporting emphasize that settlers would still require inner air membranes, heavy radiation shielding, insulation, and life-support systems to make any shell truly livable.
Scaling up production will also require overcoming gravitational differences and engineering massive field equipment, including full-size printers and bioreactors. Even so, the research team remains confident that biological chemistry will play a major role in future space exploration.
“It would surprise me if materials for future Martian engineering will not be as diverse as those used in Earth engineering — and biology will certainly contribute.”
Jishen Qiu, senior study author, via Wyomingnewsnow
