
Episode #20
The WOW! Signal
On the fifteenth of August, 1977, a radio telescope at Ohio State University picked up a seventy-two-second signal from the constellation Sagittarius. It was thirty times stronger than the surrounding background noise. It came in at the exact frequency that radio astronomers had agreed, decades earlier, was the most likely place an intelligent civilization would broadcast — the hydrogen line, 1420 megahertz, the "water hole."Three days later, the astronomer reviewing the printout circled the alphanumeric sequence "6EQUJ5" with a red pen and wrote, in the margin, the word that has named the signal ever since: Wow!This is the story of the Wow! Signal. The Big Ear telescope that was demolished in 1998. The frequency that the signal came in on, and why that mattered. The hundreds of follow-up scans that have never picked it up again. The 2016 comet hypothesis — and why most astronomers don't accept it. And the question that radio astronomers have been quietly arguing about for forty-eight years: was that signal something, or was it nothing?Episode Twenty of The Quiet Files.Sources: Jerry R. Ehman, "Wow!" — A Tantalizing Candidate (Ohio State University Radio Observatory archive, 1977); subsequent SETI reobservation campaigns, 1977 onward; Antonio Paris, Hydrogen Clouds from Comets 266P/Christensen and 335P/Gibbs as a Plausible Source of the "Wow!" Signal (Journal of the Washington Academy of Sciences, 2016); follow-up analysis by Robert Dixon and others rejecting the comet hypothesis.






