The Wow! Signal of 1977: The One Radio Message Scientists Still Can’t Explain

On the night of August 15, 1977, a printer inside an Ohio radio observatory suddenly went wild. Instead of the usual background noise—random numbers, weak static, meaningless fluctuations—it produced a short string so unusual that it jumped off the page. 6EQUJ5 It lasted just 72 seconds. Then it vanished. No repeat. No follow-up. No explanation. Decades later, that brief burst of radio energy is still known by a single handwritten word scribbled in red ink beside the printout: Wow! A Telescope That Didn’t Look Like One The signal was detected by the Big Ear radio telescope, operated by Ohio State University. Unlike dish antennas, Big Ear scanned the sky passively as Earth rotated beneath it. It listened. Patiently. Night after…