The Great Observatories
CGRO:The Compton Gamma Ray Observatory (http://heasarc.gsfc.nasa.gov/docs/cgro/)
The Compton Gamma Ray Observatory examines the universe in gamma
rays.
It was launched in April 1991.
Chandra: X-ray Observatory (AXAF) (http://asc.harvard.edu/) 
Chandra will study the universe in x-rays. It is scheduled to be
launched in 1999.
HST:
The Hubble Space Telescope (http://www.stsci.edu/)
The well-known Hubble Space Telescope, launched in April 1990,
was the first of the Great Observatories to be launched. It observes the
universe in visible light and ultraviolet light.
SIRTF: The Space Infrared Telescope Facility (http://sirtf.caltech.edu/)
SIRTF will look at the infrared universe. It is scheduled to be
launched in late 2001.
(Illustrations courtesy of NASA and the National Air and Space
Museum)
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Goddard Space Flight Center
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