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X-ray astronomy
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X-ray astronomyhas definition Detection of stellar and interstellar X-ray emission. Because X-rays are almost entirely filtered out by the Earth's upper atmosphere, the use of balloon- and rocket-borne equipment is essential.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:32:32.0
is a kind of astronomy2001-09-27 09:32:32.0