On August 15, 1977, the Big Ear Radio Observatory detected an anomalous narrowband signal lasting approximately 72 seconds. The signal originated from coordinates RA 19h 25m 12s ± 10s, Dec -26° 57' ± 20'. Signal intensity peaked at 30 standard deviations above background noise. The transmission frequency of 1420.456 MHz corresponds to the hydrogen line, a frequency of significant interest in SETI research. Multiple follow-up observations have failed to detect repeat transmissions from the source location.
CASE FILEUFOUncertain
The Wow! Signal: 72 Seconds That Changed Everything
Case Summary
A powerful radio signal from deep space defied all explanation for decades. Was it alien contact or cosmic coincidence?
Official Narrative
Evidence Archive
4 items
Document
Original Computer Printout
The famous printout showing the signal's intensity marked with "Wow!" in red ink by Jerry Ehman. The alphanumeric code "6EQUJ5" represents signal strength over time, peaking at "U" - the highest measurable intensity on the computer scale.
Radio Telescope Data Logs
Follow-up Observation Records
Frequency Analysis Report
Theories & Analysis
5 theories1
Extraterrestrial Intelligence
Source: SETI Institute2
Comet Hydrogen Cloud
Source: Antonio Paris3
Classified Military Satellite
Source: Military aerospace analysts4
Interstellar Scintillation
Source: Radio astronomy community5
Terrestrial Interference
Source: Radio frequency analystsEyewitness Accounts
3 reportsD
Dr. Jerry Ehman, Astronomer
D
Dr. John Kraus, Radio Observatory Director
D
Dr. Robert Dixon, SETI Program Director
Investigation Verdict
The Wow! Signal remains unexplained after 45+ years of investigation. While natural phenomena like hydrogen clouds or satellites have been proposed, none adequately explain the signal's precise characteristics. The failure to repeat is puzzling - both for natural sources and potential alien transmissions. Recent studies suggesting cometary hydrogen are intriguing but contested. Until we detect a repeat signal or find definitive natural explanation, the Wow! Signal stands as our most credible candidate for extraterrestrial contact, despite the astronomical odds against it.
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