On August 15, 1977 Dr. Jerry R. Ehman detected a strong narrowband radio signal while working on a SETI project at the Big Ear radio telescope of The Ohio State University. Amazed at how closely it matched the expected signature of an interstellar signal, he circled it on the computer printout and wrote the comment “Wow!” next to it. Although it lasted for a full 72 seconds, it has not been detected again.
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