SETI's Broad Frontier: Radio, Optical Searches, Technosignatures, and the Fermi Paradox

To the point

SETI is a broad effort to find intelligent life beyond Earth using radio and optical searches for technosignatures or artifacts, tracing a path from early pioneers like Frank Drake, Carl Sagan, and Iosif Shklovsky and milestones such as Ozma and the Wow! signal to current efforts (Breakthrough Listen, FAST) and a wide array of facilities (Allen Telescope Array, LOFAR, MWA, UCLA surveys) and projects (Laser SETI, PANOSETI), plus debates over METI, post‑detection scales (Rio and London), all framed by the idea that vast distances and the Fermi paradox make discoveries uncertain but potentially transformative for science and society.

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Search for extraterrestrial intelligence - Wikipedia

SETI encompasses radio and optical searches for intelligent life and technosignatures, tracing a path from early radio work and Ozma to landmark signals like the Wow!, with foundational figures Frank Drake, Carl Sagan, and Iosif Shklovsky, and a history of evolving programs—Sentinel, META, BETA, SERENDIP, SETI@home, SETI Net—and major expansions such as Breakthrough Listen, alongside cutting-edge facilities like FAST, the Allen Telescope Array, LOFAR, MWA, and UCLA’s Kepler-field surveys, while optical efforts (Laser SETI, PANOSETI) probe nanosecond-scale laser signals and debates about quantum communications and interstellar probes continue, including discussions of Active SETI (METI) and post-detection frameworks like the Rio and London scales, all within a context of Fermi-paradox–influenced expectations about detection difficulty and transformative implications for science and society.