Did Aliens Contact Earth in 1977 The WOW Signal Explained In 1977, a radio telescope in Ohio detected something extraordinary — a powerful, narrowband signal from deep space that lasted exactly 72 seconds… and then vanished forever. The signal came from the hydrogen frequency, a channel scientists believe an intelligent civilization might use to communicate. It looked intentional. Precise. Controlled. An astronomer circled the data and wrote one word in the margin: WOW. Nearly 50 years later, no
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