Researchers are turning their attention to leftover material from historic lunar missions, examining human waste and other items left behind on the lunar surface to understand how microorganisms endure extreme environments. Across the Apollo 11, 12, 14, 15, 16, and 17 missions, astronauts discarded roughly 96 bags and containers of waste before departing the Moon. These abandoned materials, the oldest of which have remained at Tranquility Base since July 1969, have spent more than half a century exposed to vacuum conditions, radiation, and harsh lunar day-night cycles.
Apollo Waste Bags Target Long-Term Microbial Survival Studies
The materials left behind were not uniform collection items. According to historical mission records, Apollo waste was packaged in several ways, ranging from small individual faecal and emesis bags to larger nylon sacks known as JETT or jettison bags. Crews used these larger sacks to gather cabin refuse before carrying them through the hatch. A single large sack typically enclosed smaller waste bags alongside food wrappers, empty water containers, wipes, and unneeded equipment. NASA’s historical documentation indicates that crews generally took one full sack outside at the beginning of each moonwalk, while later missions utilized empty sacks to manage dust on spacesuit legs during rest periods.
Biochemical Treatments and Environmental Exposure Complicate Analysis
Broader Research on Polar Microbes and Forward Contamination
The investigation into historical mission waste aligns with broader scientific efforts to understand how Earth-borne bacteria and fungi might react to extreme lunar conditions. Forward contamination—the accidental introduction of terrestrial microbes onto planetary bodies—remains a central concern for researchers seeking to prevent false discoveries when searching for native life. A recent study published in Science Advances
and led by researchers from NASA’s Goddard Space Flight Center and the University of Maryland examined whether common spaceflight organisms could survive in the deep, freezing shadows of the lunar south pole.
The research team tested the resilience of organisms such as Aspergillus niger, Bacillus subtilis, Staphylococcus aureus, Deinococcus radiodurans, and several Fusarium species under simulated laboratory conditions matching candidate landing zones including Nobile Rim, Connecting Ridge, and De Gerlache Rim. Computer models incorporating elevation maps and temperature records from the Lunar Reconnaissance Orbiter revealed that shaded polar pockets could provide survivable niches where tested microbes might persist in a dormant state. Notably, researchers found that Aspergillus niger—a fungus previously sampled on the International Space Station—could potentially endure cold polar shadows for up to a week.
Implications for Future Artemis Missions and Pristine Sample Preservation
Understanding microbial presence in extreme environments has taken on renewed urgency as space agencies prepare for long-term exploration. NASA plans to return astronauts to the lunar surface through the Artemis program to establish a permanent base at the south pole. Ensuring that microscopic biological material does not pollute pristine soil samples is vital for protecting the integrity of future geological research and the search for ancient organic compounds.
