Wow! signal
Summary
The Wow! signal was a strong, narrowband radio signal detected on August 15, 1977 by the Big Ear telescope, lasting 72 seconds and appearing to originate from the Sagittarius region. The event generated significant excitement about a potential extraterrestrial origin, but subsequent research and follow-up observations have not confirmed any replication or extraterrestrial source, though it remains a notable case in SETI discussions and the history of radio astronomy.