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Faint Object Spectrograph

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The Faint Object Spectrograph (FOS). This picture was taken after FOS was brought back to the Earth again. Credit: NASA/ESA.

The Faint Object Spectrograph (FOS) was a spectrograph installed on the Hubble Space Telescope. It was replaced by the Space Telescope Imaging Spectrograph in 1997, and is now on display in the National Air and Space Museum in Washington DC.

FOS facts

  • Instrument type: Spectrograph
  • Wavelength range: 115 to 850 nm