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PSR B1919+21 is a pulsar with a period of 1.3373 seconds, and a pulse width of 0.04 second. It was the first radio pulsar discovered (on November 28, 1967 by Jocelyn Bell Burnell and Antony Hewish). The power and regularity of the signals was thought to resemble a beacon, so for a time the source was nicknamed "LGM-1" (for "Little Green Men"). A…
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