Astronauts Harvest Scarce Metals in Space Using Bacteria and Fungi
Harnessing terrestrial ecosystems is crucial for exploring deep space and investigating extraterrestrial life. These systems incorporate bioregenerative life support systems (BLSS) and microorganisms essential for sustaining vital functions. Aboard the International Space Station (ISS), microbes propagate across surfaces, integrating themselves into the environment.
Investigations Aboard the ISS
Researchers from Cornell and Edinburgh universities examined the capacity of the bacterium Sphingomonas desiccabilis and the fungus Penicillium simplicissimum to extract metals from meteorites under microgravity conditions. These microorganisms secrete carboxylic acids, which chelate minerals, liberating them from rock formations, a process that might lessen reliance on supplies launched from Earth.
Experimental Procedure and Findings
The experiment was executed by NASA astronaut Michael Scott Hopkins. A parallel control study on Earth enabled a comparison of process efficiency in microgravity versus standard gravity. Analysis confirmed that 18 out of 44 elements were successfully bio-extracted. Notably, the fungi exhibited enhanced production of carboxylic acids in space, consequently boosting the recovery rate of palladium and platinum.
Practical Applications
The outcomes of this research underscore the prospective utility of biomining for forthcoming lunar and Martian expeditions. Microbes could become instrumental in producing construction materials from regolith and fabricating tools, thereby minimizing the necessity for resupply missions from our home planet. Furthermore, this biological extraction method holds promise for terrestrial applications, such as recovering metals from waste streams or finite resources, thereby advancing the goals of a circular economy.
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