The European X-ray Observatory Satellite (EXOSAT), originally named HELOS, was operational from May 1983 until April 1986 and in that time made 1780 observations in the X-ray band of most classes of astronomical object including active galactic nuclei, stellar coronae, cataclysmic variables, white dwarfs, X-ray binaries, clusters of galaxies, and ...
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http://en.wikipedia.org/wiki/EXOSAT
An ESA (European Space Agency) satellite for X-ray astronomy that carried out observations of variable X-ray sources in the energy range 0.05-20 keV (corresponding to wavelengths of 0.025-1.24 nanometers). On board were three instruments: an imaging telescope, a proportional counter, and a gas scint...
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http://www.daviddarling.info/encyclopedia/E/Exosat.html
European Space Agency's X-ray Observatory
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http://www.encyclo.co.uk/local/20040
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