On 15 August 1977 a radio telescope caught a 72-second burst so strong an astronomer circled it and wrote ‘Wow!’ in the margin. It sat right on the hydrogen line where SETI listens. The honest assay refuses BOTH easy answers: it was real and remains unexplained — but a genuine beacon would REPEAT, and in fifty years of listening it never has. Slide the follow-up scans and see the silence.
The signal was narrowband near 1420 MHz — the neutral-hydrogen line, the ‘water hole’ frequency SETI watches because it is universal and quiet. That, plus its strength, is why it’s tantalising. But a real periodic beacon (or a natural periodic source) would RECUR, and decades of targeted re-observation have found NOTHING. A fail-loud self-check throws unless the frequency matches the hydrogen line AND the recurrence count is zero across many follow-ups — which is why the honest verdict is neither ‘aliens’ nor ‘solved.’ ◆ VERDICT: UNEXPLAINED (alien claim UNSUPPORTED).
This is the FLUFF verdict, not DEBUNKED: a real anomaly with no confirmed explanation. A 2017 comet-hydrogen hypothesis is contested; non-repetition rules out a steady beacon but not a one-off natural event. Extraordinary claims (aliens) remain unsupported by the one thing evidence needs: a second look that confirms.