Faint Object Spectrograph

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 A technical description of the construction and operation of the FOS can be found in NASA technical report CP-2244.

Source: Wikipedia — Faint Object Spectrograph (CC BY-SA 4.0)