On duty at the Big Ear...

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Monday, August 15, 1977: On duty at the Big Ear Radio Observatory at The Ohio State University, Dr. Jerry Ehman heard radio noise that lasted 37 seconds and came from the direction of a star nearly 220 light-years away. The signal traveled at a frequency whose use is prohibited by international agreement and that is unlike those of most natural radio sources. It is known as the Wow signal and hasn’t been heard since.