On August 16, 1977, astronomer Jerry Ehman circled a sequence of six alphanumeric characters—'6EQUJ5'—on a computer printout from Ohio State’s Big Ear radio telescope and scribbled a breathless 'Wow!' in the margin. Lasting a full 72 seconds, the narrowband burst bore the unmistakable signature of an interstellar transmission, originating near the constellation Sagittarius at the hydrogen line frequency of 1420 MHz. While skeptics and optimists have spent decades debating cosmic noise versus extraterrestrial pings, the Wow! Signal became the ultimate open-source enigma of modern science. It remains one of our most tantalizing brushes with the unknown, reminding tech-driven searchers that our digital nets across the cosmos might occasionally snag something truly alien—even if only for a fleeting, unrepeatable moment.