NASA study finds Earth microbes may survive in shadowed Moon regions
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NASA scientists reported on Aug. 19, 2026, that some Earth microbes carried by astronauts may survive in sheltered, shadowed areas near the Moon's South Pole. The findings, published in Science Advances, raise concerns about contamination as humans establish a permanent lunar presence. Researchers say the same issue will matter for future searches for life on Mars.
Key Facts
- The study was published on Aug. 19, 2026, in Science Advances.
- About 1 million bacteria live on every patch of human skin roughly the size of a pencil eraser.
- Aspergillus niger, a fungus found in warm, humid environments, was one of five microbes examined in the study.
- Astronauts have collected samples of Aspergillus niger aboard the International Space Station.
- Prabal Saxena, a planetary scientist at NASA's Goddard Space Flight Center, led the study.
Microbial Survival on the Moon
NASA scientists say some microbes carried into space by human explorers may be able to survive in sheltered, shadowed areas near the Moon's South Pole. The findings underscore the importance of understanding how long Earth microbes can persist in extreme lunar environments. As people establish a more permanent presence on the Moon, contamination from astronauts could make it harder for scientists to separate ancient lunar chemistry from material introduced by humans. Researchers say the same issue will matter when missions eventually search for signs of life on Mars.
Contamination Challenges and Research
Humans inevitably carry microbes with them, with about 1 million bacteria living on every patch of skin roughly the size of a pencil eraser. Some of these organisms can escape from spacesuits and habitats into the surrounding environment. That creates a challenge for scientists hoping to study chemical evidence connected to the Moon's ancient geology or possible biology. The researchers argue that the Moon could serve as a valuable natural laboratory, where carefully monitored shadowed regions near the South Pole could allow scientists to test the real limits of microbial survival under conditions that are extremely difficult to reproduce on Earth. Before those experiments can begin, researchers need to establish a clear baseline showing what contaminants humans introduce.
Resilient Microbes in Space
Even rigorous sterilization cannot eliminate every hardy organism, such as Aspergillus niger, a fungus that commonly grows in warm, humid environments such as bathrooms and heating, ventilation, and air conditioning systems. Astronauts have collected samples of the fungus aboard the International Space Station, and previous experiments have shown that it can also survive outside the station. Aspergillus niger was one of five microbes examined in the new study because of its demonstrated resilience in spaceflight conditions. Scientists were surprised that microbes like these could endure exposure on the exterior of the space station.
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NASA study finds Earth microbes may survive in shadowed Moon regions
