Caelum Incognitum — The interactive encyclopedia of ufology
“Wow!” signal
Astronomy, exobiology & SETI
A 72-second radio signal detected on 15 August 1977 by the Big Ear radio telescope (Ohio). Astronomer Jerry Ehman circled the “6EQUJ5” sequence on the printout and wrote “Wow!”. It came from the direction of Sagittarius, near the hydrogen frequency, and was never found again. Its origin is still debated.