ELI5: wow! signal

// eli5

What is the Wow! signal?

In 1977, a telescope in Ohio picked up a really strong radio signal from space that lasted for about 72 seconds [1][2]. It was so unusual that the scientist who found it wrote "Wow!" on the printout, and the name stuck [1]. Think of it like hearing a super-loud beep on your radio that you've never heard before and can't find again [2].

Why was it so special?

The signal came on a frequency (1420.4556 MHz) that's very close to where scientists think aliens might try to talk to us [3]. It was much stronger and more focused than normal radio noise from space, which made scientists excited [2]. Nobody has ever been able to explain where it came from or what it was [1].

What does it mean?

Scientists aren't sure if it was a message from aliens, a weird natural thing in space, or even just our equipment picking something up wrong [2]. It didn't have any actual words or code in it that we could read, just a burst of strong radio energy [5]. It's like getting a mysterious phone call where all you hear is static, but the static is louder than anything you've ever heard [2].

Why do people still care?

The Wow! signal is one of the best pieces of evidence some people point to when they say aliens might be trying to contact us [2]. Even though it happened almost 50 years ago, nobody has solved the mystery of what it was [1]. It reminds us that space is full of things we don't understand yet [2].