Earth Microbes Can Survive on the Moon’s South Pole, Study Shows
Earth-origin microorganisms such as the fungus Aspergillus can survive in a dormant state for days or even months near the lunar South Pole, according to NASA research published in Science Advances. The study, which modeled surface conditions at potential Artemis landing sites using data from the Lunar Reconnaissance Orbiter, indicates that shadowed polar environments provide enough protection from ultraviolet radiation for certain resilient microbes to persist without actively growing.
Surviving the Harsh Lunar Environment
The investigation did not evaluate whether microorganisms could actively live or multiply on the Moon, according to findings cited by TechSpot. Instead, researchers sought to determine how long hitchhiking organisms might endure after arriving via spacecraft from Earth. While most of the lunar surface experiences intense ultraviolet and radiation exposure, the polar regions feature locations in permanent or near-permanent shadow with extremely low temperatures.
The Resilience of Aspergillus Fungi
Prabal Saxena, a space researcher at the NASA Goddard Space Flight Center who led the study, explained that Aspergillus proved to be the most resilient organism in the modeling. The fungus benefits from protective biological traits, including a sturdy cell wall and dark pigments capable of shielding against X-rays, cosmic rays, and ultraviolet light.
Limits of Spore Survival and Dormancy
However, survival does not equal colonization. The research team found no evidence that the fungi could reproduce in lunar conditions, meaning the microbes remain in a dormant state rather than forming active colonies on the surface.
Planetary Protection for Artemis Missions
The study highlights ongoing concerns regarding planetary protection as space agencies target the lunar South Pole for upcoming missions. Permanently shadowed craters in the region are believed to contain water ice, a critical resource for future exploration. Yet every spacecraft launched from Earth carries a baseline risk of biological contamination.
Strict Cleanliness Protocols Moving Forward
Despite rigorous sterilization procedures prior to launch, microscopic organisms are exceptionally difficult to eradicate entirely. If hardy microbes survive transit, they could introduce Earth material into previously untouched lunar environments. Beyond ecological concerns, persistent biological contamination complicates scientific efforts to determine whether future organic material discovered on the Moon is indigenous or human-introduced.
At the same time, the research notes that natural material exchange between Earth and the Moon already occurs via meteor impacts and particles, meaning human spacecraft are not necessarily introducing the first microscopic traces to the lunar surface. The findings indicate that the lunar environment is less immediately destructive to Earth life than previously assumed, reinforcing the need for strict cleanliness protocols for upcoming flights.