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“x rays”
X-rays, X rays
In astronomy, any of a class of cosmic objects that emit radiation at X-ray wavelength.
Because the earth’s atmosphere absorbs X-rays very efficiently, X-ray telescopes and detectors must be carried high above it by spacecraft to observe objects that produce such electromagnetic radiation.
Advances in instrumentation and improved observational techniques have led to the discovery of an increasing number of X-ray sources.
By the late 20th century, thousands of these objects had been detected throughout the universe.
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Astronomy and related astronomical terms
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(a radiographic technique that produces an image of a detailed cross section of bodily tissue using a narrow collimated beam of x-rays that rotates in a full arc around a patient to image the body in cross-sectional slices)