Astronomers think they've found a plausible explanation of the Wow! signal
Briefly

Astronomers hypothesized that the Wow! signal, detected in 1977, might be a communication from aliens, but recent studies suggest it could originate from natural galactic phenomena.
The signal, recorded by The Ohio State University Radio Observatory, peaked in intensity with a unique pattern: 6EQUJ5, interpreted by Ehman as a striking anomaly requiring further investigation.
Despite the initial excitement surrounding the Wow! signal, attempts by SETI researchers to replicate or detect it anew have consistently yielded no results over the decades.
Recent theories posit that the Wow! signal could be explained by beams of microwave radiation emitted from clouds of atomic hydrogen, influenced by a transient event like a magnetar flare.
Read at Ars Technica
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