x ray astronomy

x-ray astronomy

noun
the branch of astronomy that studies celestial objects by means of the x-rays emitted by them. Compare x-ray ( def 1b ).

Origin:
1960–65

x-ray astronomer, noun
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World English Dictionary
X-ray astronomy
 
n
the branch of astronomy concerned with the detection and measurement of X-rays emitted by certain celestial bodies. As X-rays are absorbed by the atmosphere, satellites and rockets are used

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American Heritage
Science Dictionary
x-ray astronomy  
The study of celestial objects by measurement of the x-rays they emit. Because the Earth's atmosphere absorbs x-rays, x-ray detectors are usually carried into space on satellites. X-rays are emitted by high-energy objects such as active galactic nuclei, supernova remnants, x-ray binary stars, neutron stars, and the regions around black holes. Objects which do not produce their own x-rays can reflect radiation from nearby stars, making it possible to study the objects using x-ray astronomy; one notable example of this is the analysis of solar x-rays reflected by the Moon.
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