The Wow! Signal: What Really Happened During Those Mysterious 72 Seconds in 1977?
On August 15, 1977, a radio telescope in Ohio detected something unusual from the direction of Sagittarius. It lasted only 72 seconds. A few days later, astronomer Jerry Ehman was reviewing a computer printout when he noticed six characters that represented an extraordinary spike in radio intensity: 6EQUJ5 Ehman circled the sequence in red ink and wrote a single word beside it: “Wow!” That spontaneous note gave a name to what would become one of the most famous unexplained events in the history of the search for extraterrestrial intelligence. Nearly half a century later, the Wow! Signal has never been convincingly detected again. The SETI Institute still describes its origin as unresolved. But something important has changed. Researchers using modern techniques to reanalyze decades-old radio astronomy data now believe they may be getting closer to understanding what happened that night—and the latest evidence points toward a fascinating possibility that does not require extrater...