Overview
- SETI reported Wednesday that radio scans found no signs of extraterrestrial technology associated with 3I/ATLAS after a peer‑reviewed analysis was published in the Astronomical Journal.
- The Allen Telescope Array collected more than seven hours of data in July 2025 and initially flagged nearly 74 million narrowband candidates before filters reduced them to about 200, all traced to Earth‑based or Earth‑orbiting sources.
- The study searched frequencies from 1 to 9 gigahertz and set upper limits on any transmitter near the comet of roughly 10 to 110 watts, comparable to the power of a household appliance.
- Planetary science observations and NASA spacecraft flybys that measured the comet’s composition and motion support the conclusion that 3I/ATLAS is a natural interstellar comet rather than an artificial object.
- Researchers say the null result is scientifically valuable because it validates rapid‑response observing methods, improves signal‑filtering techniques, and tightens detection limits for future searches of rare interstellar visitors.