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The Epic Interactive Encyclopedia 1997
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1992-09-02
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12 lines
Detection of X-rays from intensely hot gas in
the universe. Such X-rays are prevented from
reaching the Earth's surface by the
atmosphere, so detectors must be placed in
rockets and satellites. The first celestial
X-ray source, Scorpius X-1, was discovered by
a rocket flight in 1962. Since 1970, special
satellites have been orbited to study X-rays
from the Sun, stars, and galaxies. Many X-ray
sources are believed to be gas falling onto
neutron stars and black holes.