In August 1977, a radio telescope in Ohio picked up a strong signal from deep space. It lasted 72 seconds. It has never been heard again.
An astronomer circled it on a printout and wrote one word beside it: Wow! This is the story of the signal, the telescope that caught it, the explanations that have been proposed (a message, a comet, a natural fluke), and the question that is still open.
Cosmic Cold Cases reopens one unsolved case from the universe in every episode.
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