No Technosignatures Detected in Interstellar Object 3I/ATLAS; ATA Sets Upper Limits on Radio Emissions

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Scientists Sofia Sheikh and Valeria Garcia Lopez used the Allen Telescope Array to search 3I/ATLAS for technosignatures in the 1–9 GHz range, found no artificial radio signals and set upper limits of roughly 10 to 110 watts for any transmitter, which supports the conclusion that 3I/ATLAS is a natural, comet‑like interstellar object rather than alien technology.

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SETI Institute looks for signs of technology in interstellar visitor 3I/ATLAS
eurekalert.org

SETI Institute looks for signs of technology in interstellar visitor 3I/ATLAS

Scientists at the SETI Institute searched for technological signals from 3I/ATLAS, the third interstellar object observed in our Solar System. Using the Allen Telescope Array (ATA) at the Hat Creek Radio Observatory in Northern California, the team scanned a wide range of radio frequencies for signs of extraterrestrial technology and found none, as expected based on other astronomical observations showing that the object exhibits natural comet-like composition and behavior.