The 72-Second Signal That Never Came Back #space #astronomy #cosmichistory

On August 15, 1977, the Big Ear radio observatory at Ohio State University recorded a 72-second narrowband signal from somewhere in the constellation Sagittarius. The signal exceeded background noise by roughly 30 standard deviations and arrived on the 1420 megahertz hydrogen line — the frequency astronomers had long predicted any interstellar civilization would broadcast on. A few days later the astronomer Jerry Ehman circled the printout in red ink and wrote one word in the margin: Wow! In the 49 years since, more than 50 follow-up searches with more powerful telescopes have failed to detect anything from the same patch of sky. Big Ear itself was demolished in 1998 to make room for a golf course. No one knows what the signal was.

Sources: Jerry R. Ehman, The Big Ear Wow! Signal — What We Know and Don't Know (Ohio State University Radio Observatory technical memo, 1998; revised 2010). Robert H. Gray, The Elusive Wow: Searching for Extraterrestrial Intelligence (Palmer Square Press, 2012). Antonio Paris, Hydrogen Clouds from Comets 266/P Christensen and P/2008 Y2 (Gibbs) as a Plausible Source for the 1977 Wow! Signal, Journal of the Washington Academy of Sciences 103(2), 2017. SETI Institute archival materials and Allen Telescope Array follow-up reports.

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