Wow! Signal

The Wow! Signal was a strong radio transmission detected in 1977 by astronomer Jerry Ehman, who was using a large radio telescope. It appeared to be emitted from a specific point in space and lasted about 72 seconds. Its unique characteristics suggested it wasn't from any known natural source or human-made device, raising curiosity about the possibility of it being a message from an extraterrestrial civilization. Despite numerous follow-up investigations, the signal has never been observed again, leaving its origin a mystery—though it remains one of the most intriguing potential signs of intelligent life beyond Earth.