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Featured on August 15, 2022
On August 15, 1977, a radio telescope at Ohio State University recorded an odd signal from the constellation Sagittarius. An impressed astronomer circled the signal and added his own comment. Although it looked like it could have come from an extraterrestrial civilization, repeated searches in the intervening decades have come up with nothing, suggesting the signal could have been terrestrial radio interference. [Big Ear Radio Observatory and North American AstroPhysical Observatory (NAAPO)]
