SETI finds no radio technosignatures from 3I/ATLAS (opens in new tab)

The SETI Institute said Wednesday that radio observations of interstellar comet 3I/ATLAS found no evidence of extraterrestrial technology. Scientists used the Allen Telescope Array at Hat Creek Radio Observatory in Northern California to scan the object across a wide range of frequencies. The search included more than seven hours of observations in July 2025, soon after the object's discovery, and the results were published in The Astronomical Journal. 3I/ATLAS, discovered in July 2025, is th...