In 1977, astronomers detected a remarkable radio signal from deep space—now famously known as the “Wow! signal.” Captured by the Big Ear radio telescope at Ohio State University, the signal was a strong, narrowband emission near 1420 MHz, the frequency of neutral hydrogen and a prime target in the search for extraterrestrial intelligence (SETI). Astronomer Jerry Ehman, struck by its unusual intensity, circled the alphanumeric sequence “6EQUJ5” on the printout and wrote “Wow!” in the margin. Last
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How a 72 Second Signal From Space Became the Biggest Mystery in Astronomy
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Back in 1977, a mysterious signal reached Earth — lasting only seventy-two seconds. Detected by Ohio State’s Big Ear Radio Observatory while scanning the constellation Sagittarius, the signal was unlike anything ever heard before. Astronomers called it the Wow! signal. It appeared on the same hydrogen frequency scientists use in the search for extraterrestrial intelligence — 1420 MHz — and has never been detected again. Nearly fifty years later, we still don’t know who, or what, sent it. #space
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