LGM-1

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Little green men 1 (LGM-1) was the explanation given to a famous astronomical observation. In 1967, a radio signal was detected in a UK observatory by Jocelyn Bell and Anthony Hewish. The signal had a 1.337 second period and 40 millisecond pulsewidth, and originated at celestial coordinates 19:19 right ascension, 21 degrees declination. It was detected by individual observation of miles of graphical data traces. Due to its almost perfect regularity, it was at first assumed to be spurious noise, but this was promptly discarded. After that, the discoverers half-seriously proposed, as an alternative explanation, that the signal might be a beacon or a communication from an intelligent extraterrestrial civilization and named it LGM-1.

The signal turned out to be radio emissions from the pulsar CP1919 (the first one recognized as such). Bell noted that other scientists could have discovered pulsars before her, but their observations were either ignored or disregarded. She noted that Sir Fred Hoyle identified this astronomical object as a neutron star immediately upon their announcement.