SETI, the Search for Extraterrestrial Intelligence, is the scientific effort to detect signals or other technosignatures from alien civilizations, mainly by scanning the radio sky for narrow, artificial-looking transmissions. Its most famous moment remains the 1977 Wow! Signal, a strong 72-second burst near the hydrogen frequency that has never recurred or been explained. Decades of searches have found no confirmed signal, a silence that frames the Fermi paradox.
Signals & Anomalies · SETI · Radio Astronomy
On a summer night in 1977, an Ohio radio telescope recorded a narrowband burst near the frequency of hydrogen itself. An astronomer circled the printo...
Cosmology · Astrobiology · SETI
Enrico Fermi reportedly asked the question over lunch at Los Alamos in 1950. For seventy-five years it has been one of the most cited puzzles in scien...