Yeast binds sand for possible construction on Mars
A Hong Kong research group tested a biological building material under simulated Martian conditions.
Researchers at the Hong Kong University of Science and Technology have developed a building material in which genetically modified yeast and gelatine bind grains of sand. The material achieved a compressive strength of around 12 megapascals in laboratory tests, but a Mars base is still a long way off.
The research paper appeared in September in the journal Chem Circularity. The researchers combined sand with a binder made from gelatine and genetically modified baker’s yeast. The yeast produces proteins that strengthen the connection between the grains and the binder.
The trial is intended as an alternative to techniques in which Martian soil must be heated to very high temperatures to make bricks or other building elements. That requires a great deal of energy and heavy equipment, which are difficult to transport from Earth to Mars.
The researchers printed small shapes with a 3D printer under conditions that simulated the Martian surface. These involved low pressure and a temperature of around minus 30 degrees Celsius. During curing, water in the material froze and then disappeared directly as vapour, creating a lightweight, porous structure.
According to the research, the best formulation had an average compressive strength of around 12 megapascals and a flexural strength of around 6 megapascals. The study estimates that production within the limits examined could require much less energy than methods involving melting soil. That is a calculation for the laboratory model, not a measurement on Mars.
The results have clear limitations. The demonstration used terrestrial sand grains rather than actual Martian regolith. The strongest variant also contained gelatine that would have to be transported from Earth. Resistance to radiation, airtightness, thermal insulation and long-term durability have not yet been demonstrated either.
The material should therefore be regarded as a possible structural component, not as a complete habitable building. A real habitat would need additional layers and systems to maintain air pressure and provide protection against radiation. The next step is to scale up production and test the properties that were beyond the scope of this first laboratory trial.
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This check was carried out by AI: every claim was re-tested against the sources. Even an approved article can contain errors — stay critical.
The technical results and limitations were checked directly against the open research paper and two independent scientific reports. The text uses cautious wording and does not call the material a fully fledged Martian home.
- confirmed The research appeared in Chem Circularity. — The open publication gives the journal, date and DOI. source
- confirmed The material consists of sand, gelatine and genetically modified yeast. — This is stated in the research paper and the EurekAlert release. source
- confirmed The best formulation achieved around 12 MPa compressive strength and 6 MPa flexural strength. — The research summary gives both values. source
- confirmed The experiments took place at low pressure and around minus 30 degrees Celsius. — These conditions are given in the research description. source
- confirmed The trial did not use actual Martian regolith. — The scientific reports describe sand as the tested aggregate and identify this as a limitation. source
- confirmed The material is not a complete airtight or radiation-resistant habitat. — The researchers and independent explanations stress that additional systems are needed. source
Editor's note
This concerns published laboratory research, not a test on Mars. The main uncertainties are scaling up, using actual Martian regolith, radiation, durability and how a fully airtight habitat would be built.Sources
- Engineered living building material for low-energy construction on Mars — ScienceDirect / Chem Circularity
- Scientists want to 3D print houses on Mars with the help of yeast — EurekAlert!
- Mars settlers may live in houses made of yeast and gelatin — Space.com
- Basta un poco di lievito per costruire su Marte — MEDIA INAF