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

• NASA research indicates that Earth-based microbes carried by astronauts could survive in shaded regions of the Moon's South Pole.
• These findings raise concerns that human-introduced contamination could complicate future searches for signs of ancient lunar geology or biology.
• Scientists suggest utilizing these landing sites as natural laboratories to study microbial resilience in extreme conditions.

Microbial Survival in Lunar Conditions

• Researchers modeled the survival of five microbes commonly found in spaceflight environments, including Aspergillus niger, Bacillus subtilis, Staphylococcus aureus, Deinococcus radiodurans, and Fusarium species.
• The Moon's South Pole features complex terrain where craters and ridges create pockets of permanent shadow, shielding microbes from lethal ultraviolet (UV) radiation.
• Aspergillus niger, a fungus, demonstrated the highest resistance to UV radiation, surviving even in areas with partial sun exposure.

Implications for Future Exploration

• Human skin naturally carries millions of bacteria, making absolute sterilization impossible during crewed missions.
• Establishing a baseline of lunar contamination is critical, as future missions—such as those to Mars—must distinguish between introduced Earth microbes and genuine extraterrestrial life.
• While microbes may remain in a dormant state, there is currently no evidence that the Moon provides the liquid water or moderate temperatures required for microbial growth and replication.