On this day, the Big Ear radio telescope detected the WOW! Signal, a 72-second burst at 1420-megahertz, 21 cm—a strong radio signal. It is sometimes referred to as the 6EQUJ5 Signal—this is not the message—but the radio signal intensity expressed in a code used by the project.
Though this is controversial, it remains unexplained except as a SETI contact, the only SETI contact to date. (there are other explanations though none have been proven) Thanks to OrangeBean for a heads up.
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