{"data":{"id":1880,"lang":"en","title":"SETI Scans Interstellar Visitor 3I/ATLAS for Alien Signals — 74 Million Radio Hits Lead to Silence","summary":"The SETI Institute scanned interstellar visitor 3I/ATLAS with the Allen Telescope Array for 7 hours, detecting 74 million radio signals — all traced to Earth or satellites, ruling out alien technology.","category":"science","category_label":"Science","published_at":"2026-06-24T02:01:59Z","updated_at":"2026-06-24T02:01:59Z","url":"https://techtools.cz/tools/news/article/1880-seti-scans-interstellar-visitor-3i-atlas-for-alien-signals-74-million-radio","api_url":"https://techtools.cz/news-api/v1/articles/1880?lang=en","markdown_url":"https://techtools.cz/news-api/v1/articles/1880.md?lang=en","image_url":"https://scx1.b-cdn.net/csz/news/800a/2026/interstellar-object-3i.jpg","word_count":175,"reading_time_minutes":1,"sources":[{"url":"https://phys.org/news/2026-06-interstellar-3iatlas-reveals-technosignatures-hour.html","domain":"phys.org"},{"url":"https://www.eurekalert.org/news-releases/1130775","domain":"eurekalert.org"}],"translation":{"lang":"cs","id":1953,"title":"SETI prohledala mezihvězdného hosta 3I/ATLAS na signály mimozemšťanů — 74 milionů rádiových záchytů přineslo ticho","url":"https://techtools.cz/tools/news/clanek/1953-seti-prohledala-mezihvezdneho-hosta-3i-atlas-na-signaly-mimozemstanu-74-milionu","api_url":"https://techtools.cz/news-api/v1/articles/1953?lang=cs"},"content":"When 3I/ATLAS swept into our solar system in July 2025 — only the third confirmed interstellar object ever detected — scientists saw a rare opportunity. Researchers at the SETI Institute aimed the Allen Telescope Array in Northern California at the comet-like visitor for seven hours, scanning radio frequencies between 1 and 9 gigahertz for any sign of artificial transmission.\n\nThe result was near-total silence from beyond Earth. Of the 74 million narrowband signals detected, every surviving candidate after rigorous filtering — roughly 200 — was ultimately traced to satellites and terrestrial interference. The observations rule out any radio transmitter more powerful than 10 to 110 watts on or near the object, approximately the energy of a household light bulb.\n\n\"Establishing the natural distribution of interstellar objects is essential so we can eventually identify any anomalies that suggest artificial origins,\" said Dr. Sofia Sheikh of the SETI Institute. While no technosignatures were found, the search demonstrated that humanity's detection infrastructure can respond rapidly to interstellar visitors — a critical capability as such objects are expected to appear with increasing frequency."}}