In August of 1977, Ohio State’s Big Ear radio telescope received an insanely strong signal that came from the constellation sagittarius. A signal this strong could only mean that we were definitely not alone in the universe. When he saw the data, Astronomer Jerry R. Ehman wrote “Wow!” on the sheet, hence its name.

The signal lasted for 72 seconds, and has not been detected since. Many have tried to prove that the signal had come from Earth, but so far, no one can replicate the parameters the wow signal.

Therefore, aliens.