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Human-Related Microbes May Survive Moon’s South Pole, NASA Finds

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Based on NASA News Releases · Aug 19, 2026

NASA research indicates Earth microbes could survive in shadowed lunar South Pole regions, complicating efforts to distinguish native chemistry from human contamination during future Moon missions.

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Some of Earth’s microbes likely to hitch a ride to space with human explorers could survive in the shaded nooks and crannies of the Moon’s South Pole region, NASA scientists say.
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19, 2026, in Science Advances, these findings highlight a need to better understand microbial persistence in extreme lunar environments.
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As humans build a permanent presence on the Moon, it may become difficult to distinguish ancient lunar chemistry from contamination delivered by visiting astronauts.
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The concern extends beyond the Moon and on to Mars, scientists say.

NASA scientists published findings in Science Advances on August 19, 2026, showing that some Earth microbes may endure in the Moon’s South Pole’s shaded areas. The study, led by planetary scientist Prabal Saxena from NASA’s Goddard Space Flight Center, warns that human missions unavoidably introduce microbes, risking interference with geological and biological research. The research highlights the need to establish baseline contamination data before further exploration, particularly for future Mars missions where distinguishing native life from Earth organisms will be critical.

The team tested five resilient microbes—Aspergillus niger, Bacillus subtilis, Staphylococcus aureus, Deinococcus radiodurans, and Fusarium species—selected for their ability to withstand spaceflight conditions. Simulations using data from NASA’s Lunar Reconnaissance Orbiter mapped potential survival niches, from crater floors to small depressions. Aspergillus niger, highly resistant to ultraviolet radiation, survived even in partially sunlit areas, demonstrating the challenges of contamination control in lunar environments.

Contamination concerns are heightened by the Moon’s axial tilt, which creates permanent shadowed regions where water and fragile molecules may persist. These pockets shield microbes from lethal radiation, allowing dormant survival for at least one Earth day. NASA’s Aaron Regberg, a geomicrobiologist at Johnson Space Center, noted that microbes like Aspergillus niger, typically not considered extremophiles, survived outside the International Space Station, surprising researchers accustomed to sterilizing robotic spacecraft at high temperatures.

The authors emphasize that while some microbes may survive in dormant states, there is no evidence the Moon provides conditions for growth or replication, such as liquid water or moderate temperatures. Heather Graham, a co-author at NASA Goddard, stressed the importance of characterizing lunar chemistry before human visits alter potential scientific findings. The study suggests using the Moon as a natural laboratory to study microbial survival limits in environments difficult to replicate on Earth.

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