Researchers suggest that the Moon's surface may harbor tiny fragments of ancient extraterrestrial technology, proposing an innovative method for detecting signs of civilizations beyond Earth. This theoretical study does not claim to have found any proof of advanced civilizations, but rather outlines a new search strategy.
Unlike Earth, the Moon lacks a functional atmosphere and magnetic field, exposing its surface directly to the vacuum of space. It is continuously bombarded by meteorites and a constant flow of microscopic particles from the Solar System and other areas of the cosmos.
Due to the absence of water and tectonic activity, this microscopic material tends to accumulate on the surface without undergoing major alterations. In a paper released on the arXiv preprint server on June 23, scientists argue that part of this dust may originate from stellar systems outside the Solar System, carrying potential evidence of civilizations that died out long ago.
Although the study has not yet been published in a formal scientific journal, it was submitted to the International Journal of Astrobiology. Lewis Pinault, a planetary scientist at University College London and affiliated with the SETI Institute, the paper's first author, commented that the Moon accumulates space material over billions of years, much of which may be older than the Moon itself.
He added that the question raised is whether this ancestral collection could contain microscopic traces of technologies existing long before human celestial observation. Using computational models, the team calculated that technological fragments as small as three micrometers—equivalent to about 3% of the thickness of a human hair—could escape their stellar systems and travel through interstellar space for up to a billion years.
The researchers also determined the probability of this material reaching the Solar System and subsequently depositing on the Moon. The occurrence of interstellar dust within the Solar System is not mere speculation; particles of this type have already been detected in samples collected from the asteroid Bennu, which orbits between Earth and Mars, during NASA's OSIRIS-REx mission.
Analysis of Lunar Samples
To date, no lunar sample has revealed technosignatures. However, the study's authors argue that previous analysts may not have specifically looked for this type of particle, and that the quantities of collected material may have been insufficient to draw significant conclusions.
The team estimates that a sample of approximately one cubic meter of lunar regolith would be sufficient to identify at least one technological fragment. To conduct this search, they propose combining microscopy techniques, industrial material analysis, and artificial intelligence (AI) systems to assist in image identification.
Even if the first collection yields no results, this would not invalidate the hypothesis. The authors indicate that a negative result could only signal the need to refine the models or analyze a larger quantity of material.
Several space missions planned for the coming years will bring new samples from the lunar surface, including the delayed Chinese Chang'e-7 mission and future operations of NASA's Artemis program. Although these samples may contain technosignatures, the volume of collected regolith is expected to be far less than what the researchers' proposal requires.
For this reason, the scientists suggest waiting for the establishment of a permanent human base on the Moon to ensure the collection of adequate material for a complete analysis. They also consider the possibility of examining the samples directly on the lunar surface.
The SETI Institute, a leader in the global search for technosignatures, positively evaluated the proposal. Bill Diamond, President and CEO of the SETI Institute, who did not participate in the study, stated that the concept of looking for microscopic technosignatures in lunar regolith is 'extraordinarily original and eminently reasonable.' He added that this represents a new approach in methods for searching for evidence of technology as an indicator of life and intelligence outside our Solar System, expressing enthusiasm for the possibility of realizing it.
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