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Science. 1964 Nov 13;146(3646):912-7.

Lunar Occultation of X-ray Emission from the Crab Nebula.

Abstract

The x-ray flux from the Crab Nebula was observed during a lunar occultation on 7 July 1964. As the moon covered the central region of the nebula, the x-ray flux decreased gradually. The source appears to extend over a volume about 1 light-year in diameter.

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