The Wow! Signal (1977): Detected by Ohio State’s Big Ear radio telescope, this 72-second narrowband radio signal from Sagittarius was 30 times louder than background noise. Its intensity and frequency matched expectations for potential extraterrestrial communication. Astronomer Jerry Ehman circled it on printout, writing “Wow!” Despite hundreds of attempts, it never repeated. Its origin remains unknown—natural cosmic phenomena, satellite reflection, or an alien beacon? The lack of recurrence and precise location data prevents confirmation. The Wow! Signal endures as the strongest candidate for an alien transmission ever recorded, fueling SETI research.
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