Lunar Occultation of X-ray Emission from the Crab Nebula

@article{Bowyer1964LunarOO,
  title={Lunar Occultation of X-ray Emission from the Crab Nebula},
  author={Stuart C. Bowyer and E. T. Byram and Talbot A. Chubb and Herbert Friedman},
  journal={Science},
  year={1964},
  volume={146},
  pages={912 - 917}
}
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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