The Wow! Signal: 72 Seconds at 1420 MHz
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YouTubeRF & Radio History
The Wow! Signal: 72 Seconds at 1420 MHz
In 1977, the Big Ear radio telescope in Ohio detected a signal 30 times louder than the background noise of space — at 1420 MHz, the frequency hydrogen naturally emits. It lasted exactly 72 seconds and never repeated. Jerry Ehman circled it on the printout and wrote 'Wow!' in the margin. Over the next 45 years, every major radio telescope on ...
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