Bizarre Mysteries That Remain Unsolved to This Day

Wow! Signal

In 1977, astronomer Jerry Ehman used a radio signal detector to scan the stars around the constellation Sagittarius. Ehman picked up a 72-second radio frequency that appeared to be coming from deep space. He wrote "Wow!" in the margin of his computer printout, leading the bizarre sound—which is theorized to be aliens attempting contact—to be dubbed the Wow! Signal.

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Post originally appeared on Upbeat News.