In August 1977, Ohio astronomer Jerry Ehman discovered a radio signal so exciting that he wrote “Wow!” in the margin of its computer printout. Arriving from the direction of the constellation Sagittarius, the signal bore all the characteristics of an alien transmission. But despite decades of eager listening, astronomers have never heard it repeated. In this episode of the Futility Closet podcast we’ll review the story of the “Wow! signal,” which remains an intriguing, unexplained anomaly in the search for extraterrestrial intelligence.
We’ll also share some more nuggets from Greg’s database of oddities and puzzle over why a man chooses to drive a long distance at only 15 mph.
08/27/2024 UPDATE: It appears there’s a natural explanation for the Wow! signal. New research suggests that the signal occurred when an interstellar cloud of cold hydrogen was stimulated by a strong transient radiation source, causing it to brighten momentarily. This phenomenon is rare but recognized, and it matches the described characteristics of the signal. This natural explanation is much preferable to the hypothesis of an alien technology — aliens may be out there, but we don’t need them to explain what Jerry Ehman saw in 1977. Thanks to listener Eugene Chang for the tip.
See full show notes …