Scientists at the SETI Institute recently 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. The paper is published in The Astronomical Journal.

Discovered in July 2025, 3I/ATLAS is the third confirmed object from another star system to enter our solar system, after 1I/'Oumuamua and 2I/Borisov. Its interstellar origin makes 3I/ATLAS a rare opportunity to study material from another stellar system and better understand how planetary systems form and evolve.

While observations strongly indicate that 3I/ATLAS is a natural object, interstellar visitors are also compelling technosignature targets because an artificial object—however unlikely—could represent detectable extraterrestrial technology and potentially provide the first evidence of life beyond Earth.

"Eventually, our own Voyager spacecraft will be extraterrestrial artifacts in other stellar systems," said Dr. Sofia Sheikh, lead author on the paper. "Given that, it is important that we understand the natural distribution of interstellar objects so that we will be able to identify any anomalies that could one day be signs of an artificial interstellar object."