In 1977, astronomers detected a mysterious radio signal from deep space that lasted exactly 72 seconds and was 30 times stronger than background noise, leading the discoverer to write 'Wow!' on the printout; this signal was so unusual that it could not have originated from any known natural source, and despite extensive searches, it has never been detected again.
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The Wow Signal: 1977's Unexplained Radio Blast From Deep SpaceAdded:
Did you know that in 1977 [music] scientists detected a radio signal from space so strange and powerful that no one has ever been able to explain it?
The astronomer who discovered it was so shocked he wrote "Wow!" right on the printout. This signal came from deep space, lasted exactly 72 seconds, and was 30 times stronger than background noise. It's never happened again. The signal was so unusual that it couldn't have come from any known natural source.
So, what sent it?
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