Microbes Harvest Metals From Meteorites Aboard Space Station

Why It Matters

Biomining in space could reduce the need to launch heavy metal supplies, enabling longer missions and supporting in‑situ resource utilization, while also offering greener extraction techniques on Earth.

Key Takeaways

• Fungi extracted more palladium than bacteria in microgravity
• Microgravity reduced non‑biological leaching efficiency
• Bacterial and fungal metabolism shifted, increasing carboxylic acids
• 18 of 44 elements were biologically extracted on ISS
• Results suggest stable extraction across gravity conditions

Pulse Analysis

The prospect of harvesting raw materials directly from extraterrestrial bodies has moved from science‑fiction to laboratory reality. In‑situ resource utilization (ISRU) is a cornerstone of NASA’s Artemis and future Mars architectures, because launching metals from Earth remains prohibitively expensive. Biomining—using microorganisms to solubilize metals from rocks—offers a low‑mass, self‑replicating alternative that can operate under the harsh conditions of space. By leveraging the natural metabolic pathways of bacteria and fungi, engineers hope to create closed‑loop life‑support systems that produce critical components such as catalysts and electronics on demand.

The Cornell‑Edinburgh team tested this concept on the International Space Station, exposing a fragment of an L‑chondrite meteorite to the bacterium Sphingomonas desiccabilis and the fungus Penicillium simplicissimum. Metabolomic analysis revealed a surge in carboxylic‑acid production by the fungus, which correlated with a marked increase in palladium, platinum and other platinum‑group element recovery. While traditional chemical leaching lost efficiency in microgravity, the microbes delivered consistent extraction across 18 of the 44 measured elements, demonstrating resilience to the absence of gravity.

These findings open a pathway for autonomous metal recovery on lunar bases, asteroid mining vessels, or deep‑space habitats, potentially shrinking launch mass and supporting a circular economy beyond Earth. On the ground, the same strains could be deployed to treat mine tailings or extract valuable metals from low‑grade ores, aligning with sustainability goals. However, scaling biomining for space will require robust bioreactor designs, radiation‑hard microbes, and precise control of metabolic outputs. Continued interdisciplinary research will be essential to translate ISS results into operational ISRU technologies.