Bold claim: Microbes could be the tiny crew that unlocks deep-space exploration, and they might already be hitching a ride with us wherever we go. But here’s the controversial twist: these invisible passengers aren’t just passengers—they could become essential partners in harvesting metals from space rocks. In short, life’s tiniest transformers could power humanity’s next leap beyond Earth.
If humans are going to venture into the far reaches of space, we can’t leave microbes behind. They live on and inside our bodies, cling to surfaces, and ride along with our food, so understanding how they respond to space is not just academic—it’s practical. Beyond surviving space, microbes might actively help us obtain resources we need, reducing the burden of carrying everything from Earth.
Researchers from Cornell and the University of Edinburgh explored whether microorganisms can extract precious metals from meteorites in a microgravity environment. Their experiment, conducted aboard the International Space Station, focused on how microbes might facilitate what’s called “biomining.” They found that fungi, in particular, excel at retrieving palladium, a valuable platinum-group element, from asteroid-derived material, while removing the fungus dampens nonbiological leaching in microgravity.
The study, spearheaded by Rosa Santomartino of Cornell and co-authored with Alessandro Stirpe, was published January 30 in npj Microgravity. The BioAsteroid project, led by Charles Cockell of the University of Edinburgh, used the bacterium Sphingomonas desiccabilis and the fungus Penicillium simplicissimum to probe which elements could be drawn from L-chondrite-like asteroid material. A key goal was not only to learn what happens in microgravity but also to understand how these microbes interact with rocks in space.
Santomartino emphasized that this represents a pioneering ISS experiment on meteorites. The researchers aimed for a balanced approach: two very different species with distinct extraction profiles, kept relevant to broader applications while acknowledging the unique space environment. “These are two completely different species, and they will extract different things,” she explained. “We wanted to understand how and what, but keep the results relevant to a broader perspective because not much is known about the mechanisms that influence microbial behavior in space.”
Microbes are attractive for resource extraction because they secrete carboxylic acids—carbon-rich compounds that can bind to minerals and promote their release. Yet many questions remain about how this mechanism works in space. To investigate, the team performed a metabolomic analysis: sampling the liquid culture from finished experiments to catalog the biomolecules, especially secondary metabolites, produced by the microbes.
NASA astronaut Michael S. Hopkins conducted the ISS experiment to test microgravity effects, while a terrestrial control experiment ran in the lab to compare outcomes on Earth. Santomartino and Stirpe then sifted through a large dataset covering 44 elements, of which 18 were biologically extracted.
Stirpe described the analytical process: researchers asked whether extraction behaved differently in space versus Earth, whether bacteria or fungi—or both—were more effective, and whether what they observed was meaningful signal or noise. The findings revealed notable shifts in microbial metabolism in space, particularly for the fungus, which ramped up production of many molecules, including carboxylic acids, and enhanced the release of palladium, platinum, and other elements.
Nonbiological leaching tended to underperform in microgravity compared with Earth for many elements, while the microbes produced consistent results across both environments. In some cases, the microbe didn’t improve extraction per se, but it helped keep extraction steady regardless of gravity. Notably, the rate of extraction varied widely depending on the specific metal, the microbe involved, and the gravity condition.
Beyond space exploration, the research hints at terrestrial benefits, such as more efficient biomining in resource-limited settings, mining waste remediation, or developing sustainable biotechnologies for a circular economy. Santomartino cautions that the biotech community should expect complexity rather than tidy, universal answers. Space conditions interact with a vast diversity of microbes in unpredictable ways, so results can differ dramatically across species, methods, and environments.
“Depending on the microbial species, space conditions, and the methods used, everything changes,” she noted. “Bacteria and fungi are incredibly diverse, and space is a complex variable. Right now, there isn’t a single definitive explanation. That, to me, is the beauty and challenge of this work.”
Would you like these ideas explored further with practical examples of how space biomining could translate to real-world mining or recycling challenges on Earth? And do you think microbes will ultimately reshape how we source materials in space, or is the technology still too uncertain to rely on? Share your thoughts in the comments.
