Wow! signal as a potential extraterrestrial transmission

Record	OBS-0257
Category	Space/NASA
Status	UNPROVEN
Summary	The Wow! signal was a strong narrowband radio signal detected in 1977 by Ohio State University's Big Ear radio telescope. It has never been detected again, and its origin remains unexplained. Some proponents suggest it could be evidence of extraterrestrial intelligence.
Origin	Detected on August 15, 1977, by the Big Ear radio telescope at Ohio State University, and discovered by astronomer Jerry R. Ehman a few days later.
Claimed	The signal was a narrowband radio emission at 1420 MHz, the hydrogen line, which is a frequency that extraterrestrial civilizations might use for communication. The signal's intensity and duration matched expectations for a distant, stationary source of artificial origin. The signal has not recurred despite numerous follow-up searches, suggesting it may have been a one-time transmission. Recent reanalysis of archived data suggests the signal was even stronger than originally thought and may have come from a different location.
Evidence / consensus	The scientific community regards the Wow! signal as an unexplained anomaly. No confirmed natural or artificial explanation exists, but the lack of repetition and the absence of corroborating evidence prevent any definitive conclusion. Most experts consider it unlikely to be a confirmed extraterrestrial signal without further data.

> OBSERVER NOTE:
A classic SETI anomaly. The signal's single occurrence and lack of replication keep it in the 'unexplained' file, not the 'confirmed alien' file. The recent reanalysis adds data but no definitive answer.

Sources

Sources are external and provided for verification. Listing does not imply the Observer endorses their claims.