The Mysterious Wow! Radio Signal

In 1977, a telescope captured a powerful, intense radio signal from deep space that lasted 72 seconds. It carried all the characteristics of an artificial origin but has never been heard again.

Astronomer Jerry Ehman was so stunned by the data printout that he circled the code and wrote Wow! in the margin. The signal came from the constellation Sagittarius and perfectly matched what experts expected from an interstellar transmission. Despite decades of intense study and advanced listening efforts, no one has ever identified the source. It remains one of the most famous unsolved mysteries in the search for alien life.