1977 Ohio State University's Big Ear radio telescope picked up a very unusual signal that has come to be known as the WOW signal. It was unusually strong for cosmic radiation. Further, it was narrow band. Normal cosmic radiation is broadband, that is spread over several frequences, but the WOW signal was confined to a very narrow band.
It has long puzzled astronomers because there is no known source for such a signal. Terrestrial interference was considered and discarded, and other natural possibilities have also not held up.
Naturally an alien source has been a favorite of many. I'm not sure about that, I've watched enough 1950s sci-fi movies to know that aliens are always warning humans to knock-it-off before we create a super weapon that blows up the universe. It could be a declaration of war before they come to Earth to stomp us flatter than a pancake to save the cosmos. You never know.
Anyway, this video purports to have explain a natural cause for the WOW signal. They claim that it clears it all up, but we've heard that before.
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