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EXOSAT
The Exosat satellite 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, ...
The EXOSAT Observatory
The European Space Agency's X-ray Observatory, EXOSAT, was operational from May 1983 to April 1986.
EXOSAT
European Space Agency's X-ray Observatory
extragalactic
Outside of, or beyond, our own galaxy.
Exosat satellite (Imagine the Universe Dictionary - NASA GSFC) European Space Agency's X-ray Observatory exosphere (NASA Thesaurus / NASA SP-7, 1965) The outermost, or topmost, portion of the atmosphere.
Based on EXOSAT observations, this object is believed to be a relatively bright, quiescent x-ray source that emits broadband flares and frequent x-ray flares (Güdel et al, 2001; Gotthelf et al, 1994; Schmitt et al, 1994; and Pallavicini et al, 1990).
During the 1980s the European, Russian, and Japanese space agencies continued to launch successful X-ray astronomy missions, such as the European X-ray Observatory Satellite (EXOSAT), Granat, the Kvant module (of the Mir space station), Tenma, ...
This radiation is in the energy range of X-rays and can be easily observed with space-based telescopes such as Chandra X-ray Observatory, XMM-Newton, ROSAT, ASCA, EXOSAT, Astro-E2, and future missions like Con-X and NeXT.
References
See also ...
 See also: Energy, X-ray, Rays, Astrophysics, Sun
  
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