On August 15, 1977, astronomers detected a radio signal so powerful and strange, they simply wrote “Wow!” on the printout. 📡

It lasted exactly 72 seconds. It came from the constellation Sagittarius. And it matched the frequency of Hydrogen (1420 MHz)—the exact frequency scientists believe intelligent aliens would use to communicate.

But here is the scary part: despite searching for 47 years, the signal never returned.

Was this our first contact with an alien civilization, or just a cosmic glitch? We explore the biggest mystery in SETI history.

What do YOU think the Wow! Signal really was? Tell us in the comments! 👇

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