The Wow! Signal

Overview

A strong narrowband radio signal detected by the Big Ear radio telescope (1977) that bore the hallmarks of a potential extraterrestrial origin.

Investigation

The signal lasted for 72 seconds and has never been detected again. Its precise origin remains unknown, despite numerous attempts to re-detect it.

Why it matters

One of the strongest candidates for an extraterrestrial radio signal ever detected, fueling the search for intelligent life beyond Earth.