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NASA's Great Observatories for Space Astrophysics are a family of four orbiting satellites carrying telescopes designed to study the Universe in both visible light and non-visible forms of radiation.
Hubble Space Telescope
The first in the series was the Hubble Space Telescope launched in 1990. Hubble observes in visible light.
Compton Gamma Ray Observatory
The second Great Observatory was the Compton Gamma Ray Observatory launched into Earth orbit from space shuttle Atlantis in 1991.
Chandra X-Ray Observatory
The third Great Observatory is the Chandra X-Ray Observatory launched in 1999.
Space Infrared Telescope Facility
The fourth Great Observatory will be the Space Infrared Telescope Facility (SIRTF) to be launched in 2003.
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