Scientists with the SETI Institute have completed a radio search of the interstellar object 3I/ATLAS but detected no signs of extraterrestrial technology. The observations, conducted with the Allen Telescope Array, confirmed the object's natural origin.
The object, first identified in July 2025, is only the third confirmed interstellar visitor to enter the Solar System. Researchers examined it for more than seven hours across frequencies from 1 to 9 gigahertz.
Nearly 74 million narrowband signals were recorded during the search. All were traced to human-made sources or satellites after analysis.
The study ruled out any transmissions stronger than 10 to 110 watts from the object. Observations began less than 24 hours after its discovery was announced.
"It is important that we understand the natural distribution of interstellar objects so that we will be able to identify any anomalies," said lead author Dr. Sofia Sheikh.