
Back in 1977 Astronomer Jerry Ehman was using the Ohio State University’s Big Ear Radio Telescope sweeping for potential signals from alien civilizations. While monitoring the skies he came across a very powerful signal that lasted for exactly 72 seconds coming from the area of Chi Sagittarii. Dubbed the WOW signal because he circled the numbers and letters on a printed readout and wrote Wow! next to it.
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