x-ray astronomy

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x-ray astronomy

n.
The branch of astronomy that uses observations of emissions in the x-ray part of electromagnetic spectrum to study extraterrestrial sources such as stars, galaxies, and interstellar gas clouds.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

X-ray astronomy

n
(Astronomy) 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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

x-ray astronomy

The branch of astronomy dealing with the detection of objects in space by means of the x-rays they emit.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
The enormous scope for the L2 mission, with an order of magnitude greater photon grasp and 100 times better spectral resolution than XMM, is underlined by the recently published 3XMM source catalogue containing over 375,000 cosmic X-ray sources.
As this issue of Sky & Telescope went to press the observatory's systems were being checked out in preparation for the next big step: opening the aperture cover and taking Chandra's first images of cosmic X-ray sources.