An orbiting observatory built and operated jointly by NASA and the European Space Agency which is equipped with a main mirror 2.4 meters (94.5 inches) in diameter. Science operations are conducted from the Space Telescope Science Institute (STScI) in Baltimore, Maryland. Following upgrades and repairs since its launch on April 25, 1990, the main science instruments attached to the telescope are Wide-Field and Planetary Camera 2 (WFPC-2), the Near Infrared Camera and Multi-Object Spectrometer (NICMOS), the Space Telescope Imaging Spectrograph (STIS), and, installed in 2002, the Advanced Camera for Surveys (ACS).
Following upgrades and repairs since its launch on Apr. 25, 1990, the main science instruments attached to the telescope are the Wide-Field and Planetary Camera 2 (WFPC-2), the Near Infrared Camera and Multi-Object Spectrometer (NICMOS), the Space Telescope Imaging Spectrograph (STIS), and, installed in 2002, the Advanced Camera for Surveys (ACS). In August 2004, the STIS, which had accounted for 30% of the telescope's observing time, stopped working.
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