A geologist affiliated with the SETI Institute has published a study arguing the moon may harbor microscopic traces of extraterrestrial technology billions of years old, and that NASA's upcoming Artemis missions could be the vehicle to find out.
Lewis Pinault, a geologist working with the nonprofit famous for scanning deep space for radio and laser signals from advanced civilizations, wants to flip the search closer to home. His study, published on the preprint server arXiv and submitted to the International Journal of Astrobiology for peer review, proposes that the lunar surface, specifically the fine, powdery soil known as regolith, could contain microscopic "engineered particles" deposited over billions of years from across the solar system and interstellar space.
The idea rests on a simple geological fact. Earth's atmosphere, water, and volcanic activity constantly churn and erase surface material. The moon has none of those forces. Its surface sits cratered and pockmarked from eons of asteroid impacts, undisturbed by weather or tectonic shifts. If alien technology, even in particle form, ever drifted through the solar system, the moon may have caught and preserved it like a dusty time capsule.
In a statement released through the SETI Institute, Pinault described the logic behind the proposal:
"The moon has been quietly accumulating material from space for billions of years, much of it likely billions of years older than the moon itself. We're asking whether that ancient collection might contain microscopic traces of technologies that existed long before humans ever looked up at the sky."
His study modeled how extraterrestrial technology could theoretically travel between stars, survive the journey through open space, and settle into the lunar surface as a permanent feature. The SETI Institute highlighted the work in a September press release, calling future moon missions "an unprecedented opportunity" to collect soil samples that could reveal whether alien technology ever reached our celestial neighborhood, deliberately or by accident.
Researchers say the tools already exist to begin the hunt. The press release noted that current artificial intelligence and laboratory technology could search for and test microscopic technosignatures, the term scientists use for detectable signs of engineered, non-natural origin, in lunar samples.
The timing is not accidental. NASA's Artemis campaign is building toward a series of crewed and uncrewed missions designed to establish a $20 billion moon base where rotating crews of astronauts would live and work for extended stays. Following the Artemis II mission in April, NASA is targeting one more test mission in 2027 before attempting a human moon landing the following year.
SETI researchers have proposed that those Artemis missions could double as sample-collection opportunities. Astronauts or robotic systems gathering lunar soil for geological study could simultaneously supply material for technosignature analysis, piggybacking alien-hunting science onto missions already funded and scheduled.
The United States is not the only country with lunar ambitions. China is racing to return humans to the moon in the years ahead, adding geopolitical urgency to American plans. Every sample brought back represents data no other nation possesses.
Pinault's study has not yet cleared peer review. It sits on arXiv, a widely used preprint server where researchers post papers before formal journal acceptance, while the International Journal of Astrobiology evaluates it. That distinction matters. Preprints allow the scientific community to examine and critique findings early, but they lack the stamp of formal vetting.
Several questions remain open. The study describes the target as microscopic "engineered particles," but what specific forms those particles might take, and how scientists would distinguish them from naturally occurring lunar material, is not detailed in the available reporting. Nor is it clear which specific Artemis missions SETI envisions as the collection vehicle, or whether NASA has expressed any interest in incorporating technosignature research into its mission plans.
The SETI Institute has built its reputation on decades of patient listening, pointing telescopes at the sky and waiting for a signal that has never arrived. Pinault's proposal represents a different approach: stop listening and start digging. Whether the moon's ancient dust holds anything worth finding is an open question. But with American boots headed back to the lunar surface and billions of taxpayer dollars already committed, making sure those missions squeeze every possible discovery out of the trip is just common sense.
