Since the interstellar object (ISO) 3I/ATLAS was first discovered on July 1, 2025, it has garnered much attention, including speculation, hopes and fears that it may somehow contain evidence of technologically advanced civilizations outside of our solar system.

Now, a new paper published on the arXiv preprint server details the findings from radio observations made at the 100-meter Green Bank Telescope as a part of the Breakthrough Listen program, designed to look for signs of alien life. The data were taken on December 18, 2025—the day before the object’s closest approach to Earth, and those hoping for evidence of advanced alien civilizations may not like the results.