No Technosignatures Detected in Interstellar Object 3I/ATLAS Across a Multi-Instrument, 1–12 GHz Search

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No technosignatures were detected from 3I/ATLAS across multiple observatories and wavelengths, and while findings are consistent with natural astrophysical processes, the object remains a highly interesting target for ongoing, ultra-sensitive, multi-wavelength searches, in line with earlier proposals by Freitas and Valdes and subsequent work by Davenport et al.

Breakthrough Listen observations of interstellar object 3I/ATLAS
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Breakthrough Listen observations of interstellar object 3I/ATLAS

A coordinated, multi-wavelength search for technosignatures from interstellar object 3I/ATLAS in 2025 using the Allen Telescope Array, MeerKAT, the Vera C. Rubin Observatory, Parkes Murriyang, and the Green Bank Telescope found no artificial emissions, with radio limits around 0.1–110 W EIRP over 1–12 GHz (and related bands) and optical constraints on transient lasers, consistent with natural astrophysical processes and keeping 3I/ATLAS a highly compelling target for ongoing, ultra-sensitive investigations.