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In page X-ray:

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  • X-ray astronomy, which is an observational branch of astronomy, which deals with the study of X-ray emission from celestial objects.[citation needed]
  • X-ray microscopic analysis, which uses electromagnetic radiation in the soft X-ray band to produce images of very small objects.[citation needed]
  • X-ray fluorescence, a technique in which X-rays are generated within a specimen and detected. The outgoing energy of the X-ray can be used to identify the composition of the sample.[citation needed]