SETI Institute: Listening for Extraterrestrial Intelligence—History, Methods, and Milestones

To the point

Founded in 1984 by Tom Pierson and Jill Tarter after NASA stopped funding, the SETI Institute searches for intelligent life beyond Earth by listening with radio and optical methods rather than sending signals, using facilities like the Allen Telescope Array and LaserSETI, tracing ideas from Morrison and Cocconi in 1959 and Frank Drake’s Ozma project to the Phoenix searches and observations of Tabby’s Star and TRAPPIST-1, evaluating how powerful a distant transmitter would need to be to be detected and considering other channels, while committing to verify, publicly disclose, and seek international input before replying if a real signal is found under 2010 protocols.

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A Primer on SETI at the SETI Institute

From its NASA-rooted origins and private philanthropy sustaining it after funding cuts, the SETI Institute—founded by Tom Pierson and Jill Tarter—pursues a passive radio and optical search for intelligent life, focusing on the water hole around 1420–1666 MHz and laser-like signals, tracing milestones from Morrison and Cocconi’s 1959 interstellar radio reasoning and Drake’s Ozma of 1960 to Project Phoenix’s targeted searches of ~1,000 nearby stars with Parkes, Green Bank, and Arecibo, the later Allen Telescope Array (with LaserSETI) and its observations of Tabby’s Star, TRAPPIST-1, the WOW signal, and ‘Oumuamua, while sensitivity analyses suggest detectable narrow-band transmissions at tens of kilowatts within 50 light-years, isotropic transmissions at hundreds of gigawatts, exploration of gravitational waves, neutrinos, or quantum-entanglement schemes with no practical faster-than-light messaging, that no definitive detections have occurred due to limited sky coverage and sensitivity, and that any real detection would follow 2010 protocols for verification, public disclosure, and international consultation before a reply.