A rare visitor from another star system, named 3I/ATLAS, recently passed through our solar system. This event prompted scientists from SETI (Search for Extraterrestrial Intelligence) to investigate if it could be alien technology. However, their findings suggest the object is a natural comet.
Searching for Alien Signals
Scientists used the Allen Telescope Array (ATA) in Northern California to look for signs of alien technology from 3I/ATLAS. They scanned a wide range of radio frequencies for artificial signals. The team found no evidence of extraterrestrial technology, which aligns with earlier observations that showed 3I/ATLAS behaving like a natural comet.
3I/ATLAS was discovered in July 2025. It is only the third confirmed object from another star system to enter our solar system. The previous two were 1I/’Oumuamua and 2I/Borisov. These rare objects offer a unique chance to study material from other stars, which helps scientists understand how planetary systems form and change.
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Start Your News DetoxEven though 3I/ATLAS appears natural, interstellar visitors are important targets for finding technosignatures. If one of these objects were artificial, it could carry detectable signs of alien technology. This could provide the first proof of life beyond Earth.
Dr. Sofia Sheikh, the lead author of the study, explained that our own Voyager spacecraft will eventually become alien artifacts in other star systems. She noted it is important to understand natural interstellar objects. This way, scientists can identify any unusual objects that might be artificial.
What the Search Found
The research team observed 3I/ATLAS for over seven hours using the ATA. They monitored frequencies from 1 to 9 gigahertz. This range helps scientists look for narrowband radio signals, which do not occur naturally and could point to technology.
During their observations, the scientists found nearly 74 million narrowband signals. After removing radio interference from human activity and selecting signals that matched the object's movement, about 200 candidates remained. A closer look showed that all these signals came from technology on Earth or from satellites orbiting our planet.
While no technosignatures were found, the search set new limits on what could be near 3I/ATLAS. It also supports the idea that the object is natural. The observations ruled out radio transmitters stronger than about 10–110 watts across the frequencies studied. This is roughly the power used by a typical household appliance.
Valeria Garcia Lopez, a co-author, said the results show it is realistic to detect a signal with today's technology. She emphasized the importance of continuing to search for technosignatures, even from objects that might not be expected to have signals.
Preparing for Future Visitors
This project also showed how quickly the Allen Telescope Array can respond to new discoveries. Observations of 3I/ATLAS began less than a day after it was announced. This proves the system can quickly investigate newly found interstellar visitors.
Studying these objects helps scientists understand the natural properties of material traveling between star systems. As more interstellar visitors are discovered, each one offers another chance to search for technosignatures. This also expands our knowledge of both natural cosmic objects and the possibility of advanced technology beyond our solar system.
Deep Dive & References: A Search for Radio Technosignatures from Interstellar Object 3I/ATLAS with the Allen Telescope Array - The Astronomical Journal, 2026
