How can microbes mine meteorites in space?

Question

Hans Steiner · Accepted Answer

Microbial biomining works in microgravity

Space-based experiments have shown that certain microbes—especially fungi—can pull metals out of meteorite material in microgravity conditions aboard an orbiting laboratory. In these trials researchers exposed meteorite fragments to microbial cultures and found that the microbes secreted compounds that solubilize and mobilize metal atoms, enabling recovery without heavy mechanical processing.

This matters because extracting useful elements where they are found avoids the prohibitive cost of hauling raw materials from Earth. If microorganisms can be harnessed to leach metals from asteroids or small bodies, future missions could manufacture components, electronics or propellant feedstocks in space rather than launching them from the ground.

Key implications

In‑space resource use: Biological processing could turn meteorite and asteroid material into metals and minerals needed for construction, repair or fuel production.
Lower launch mass and cost: Sourcing materials off‑world reduces dependence on Earth‑launched payloads and can enable longer, more sustainable missions.
Environmental and engineering benefits: Microbial methods can operate at low temperatures and use less energy than high‑temperature metallurgy, which is attractive for space platforms.

Challenges remain. Experiments so far are proof‑of‑concept: researchers must scale yields, speed up extraction, and design containment and sterilization protocols to meet planetary‑protection rules. Engineers also need systems that integrate biological processing with downstream metal refinement in microgravity. Nonetheless, demonstrating efficient biomining in orbit shifts asteroid mining from theoretical to practical and opens a new route for sustainable off‑Earth manufacturing and exploration.