The Compton Gamma Ray Observatory satellite with solar panels unfurled is pictured here high above w

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The Compton Observatory
The Compton Gamma Ray Observatory satellite with
solar panels unfurled is pictured here high above
western Africa just prior to its release into
orbit. The large round domes of the EGRET
(bottom) and COMPTEL (center) experiments are
visible in this view along with four of the eight
BATSE detectors located at the corners of the
satellite. The OSSE experiment housing is
visible just above the COMPTEL dome. Credit
NASA
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Diffuse X-ray Spectrometer
The Diffuse X-Ray Spectrometer (DXS) experiment
was flown as an attached payload in the January
1993 flight of Space Shuttle Endeavor. Developed
by the University of Wisconsin, the DXS was
designed primarily to detect the diffuse X-ray
background with roughly 10 eV energy resolution
and 15 degree angular resolution. Credit NASA
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The Solar Max Mission
The Solar Maximum Mission (SMM), launched in
February 1980 to study the Sun during the high
part of the solar cycle, carried two high energy
experiments the Hard X-ray Burst Spectrometer
and the Gamma-Ray Spectrometer. A malfunction in
the satellite in 1981 halted the original
mission. The space shuttle Challenger serviced
the SMM in orbit in 1984, which enabled the
satellite to function through 1989. Credit
NASA
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Spartan-1
Spartan-1 was designed to be deployed from the
space shuttle Discovery and then recovered after
2 days in orbit. Aboard the Spartan platform
were X-ray detectors sensitive to the energy
range 1-12 keV. Launched in June 1985, Spartan-1
observed the Perseus cluster of galaxies and our
galactic center region. Credit NASA