August 15, 1977. A radio telescope at Ohio State University picked up something extraordinary.
The signal was powerful. Narrow band. Exactly at 1420 MHz — the frequency of hydrogen, the most common element in the universe. It lasted 72 seconds. And then, it was gone.
Dr. Jerry Ehman, reviewing the data three days later, circled the printout and wrote one word in the margin: WOW.
It was the strongest narrowband radio signal ever detected from space. It matched exactly what an alien transmission might look like.
But it was never detected again. Despite hundreds of follow-up observations, the Wow Signal remains unexplained to this day.
Was it aliens? A hydrogen cloud? A satellite? A secret military test? The universe remains silent.
One word. Three letters. Still waiting for an answer.
🦋
