SETI, Breakthrough Listen Find 0 Alien Signals From 3I/ATLAS After Screening 74 Million Hits
Updated
Updated · Futurism · Jun 8
SETI, Breakthrough Listen Find 0 Alien Signals From 3I/ATLAS After Screening 74 Million Hits
3 articles · Updated · Futurism · Jun 8
Summary
A new Astronomical Journal paper found none of 211 shortlisted radio signals from interstellar object 3I/ATLAS showed any technological origin; all were traced to human-made radio interference.
Using 7.25 hours of Allen Telescope Array data, researchers cut nearly 74 million narrowband hits to about 2 million candidates before algorithmic filtering produced the final 211 signals of interest.
The result undercuts claims that 3I/ATLAS could be an alien probe, reinforcing the broader scientific view that the object is a comet despite speculation over its unusual properties.
An earlier Breakthrough Listen search with the Green Bank Telescope also found no candidate signals, though the team said the exercise shows current instruments can realistically test interstellar objects for technosignatures.
With no radio signals from 3I/ATLAS, are we searching for the wrong kind of alien technology?
What secrets of a distant star system does the unique chemistry of interstellar comet 3I/ATLAS reveal?
As scientists adopt a 'No Reply' protocol, is humanity truly prepared for first contact?
3I/ATLAS in 2025: Technosignature Search Results and Implications for Interstellar Object Exploration
Overview
In 2025, astronomers worldwide turned their attention to 3I/ATLAS, the third confirmed interstellar object to pass through our Solar System. Identified as an interstellar comet, 3I/ATLAS follows a retrograde orbit with a steep inclination of 175 degrees, suggesting it originated from the thin disk of stars in the Milky Way. Scientists are actively studying its size and physical properties, with observations continuing until September 2025 before it passed too close to the Sun. Renewed visibility is expected by early December 2025, offering more opportunities to learn about this mysterious visitor from beyond our Solar System.