BIOLOGY • RADIATION • SPACE HABITATS • OCTOBER 2026
Could Black Fungi Help Shield Future Space Habitats from Radiation?
Evidence level: Laboratory observations and a small proof-of-concept experiment on the International Space Station. Not an established or certified spacecraft shielding technology.
From Chernobyl to space
Researchers studying highly contaminated environments around the Chernobyl nuclear accident found dark, melanin-rich fungi, including Cladosporium sphaerospermum. Such fungi can survive significant radiation exposure. Experiments have also reported changes in growth and metabolism under ionizing radiation, prompting research into whether melanin helps organisms tolerate or exploit radiation-related energy. The popular description “fungi eat radiation” oversimplifies an unresolved biological mechanism: radiation is not a substitute for all nutrients or energy requirements.
The space-station experiment
In a small study aboard the International Space Station, researchers grew C. sphaerospermum over a radiation detector and compared readings with a control detector. As the fungal layer grew, researchers reported a modest reduction in measured radiation beneath it. The experiment was an early demonstration, not a test of a complete protective habitat wall. The result should not be extrapolated directly to the complex mixture of galactic cosmic rays and solar particle events faced on Mars or during deep-space travel.
Why melanin matters
Melanin is a dark pigment that can absorb and dissipate energy and may contribute to resistance against ionizing radiation. Some studies suggest radiation-related changes in its electronic properties, but claims of “radiosynthesis” as a broadly proven analogue of photosynthesis are premature.
Engineering possibilities and limits
Biologically grown materials might someday be produced using fewer imported resources, or incorporated into layered shielding systems. Key questions include shielding effectiveness per unit mass, water content, long-term viability, contamination control, material stability, and performance against high-energy particles. Traditional shielding materials such as water and hydrogen-rich polymers remain better characterized.
MKP assessment
This is a credible and creative research direction at the intersection of microbiology, radiation physics and space colonization. It is not evidence that astronauts can safely live behind a thin wall of fungus, nor proof that Chernobyl fungi are uniquely adapted to thrive on radiation alone.
Research sources
Shunk et al. (2020), proof-of-concept ISS study preprint
NASA — space radiation research and human exploration
Educational summary; not an engineering recommendation. Published October 25, 2026.