The Wow! Signal: What Sent a Powerful Radio Burst Toward Earth?
On August 15, 1977, Ohio State University’s Big Ear radio telescope recorded an unusually strong narrowband radio signal near the frequency associated with neutral hydrogen. The telescope was operating unattended. Days later, volunteer astronomer Jerry R. Ehman found the unusual pattern on a computer printout: 6EQUJ5. He circled it in red ink and wrote one word beside it: “Wow!” The six characters were not a message. They were coded measurements of radio intensity, rising and falling over about seventy-two seconds in a shape consistent with a compact source passing through Big Ear’s fixed observing beam as Earth turned. But the signal appeared in only one of the telescope’s two receiving beams, and it never returned during later searches. For decades, researchers considered terrestrial interference, satellites, reflected transmissions, natural astronomical activity, comets, and the possibility of an artificial extraterrestrial transmitter. Follow-up observations, including a targeted Very Large Array search, narrowed some possibilities but found no convincing counterpart. Recent archival work has given the mystery a new direction. Researchers associated with the Arecibo Wow! Project have identified weaker natural hydrogen-line radio features and proposed that a rare astrophysical flare could have amplified hydrogen emission into a powerful transient burst. Yet no specific cloud, flare, star, or other physical source has been tied conclusively to the 1977 event. The Wow! Signal remains a documented observation, not confirmed contact. Its lasting question is simple: what produced the radio energy Big Ear recorded that night? This podcast uses artificial intelligence in its research, writing, production, and narration. Episodes are editorially reviewed before publication. #TheUnsolvedFiles #Documentary #WowSignal #BigEarTelescope #JerryEhman