In February 1997, six astronauts aboard the Discovery space shuttle carried out a commissioning mission of the Hubble Space Telescope that included a technical review and the installation of two powerful observation instruments: the STIS (Space Telescope Imaging Spectrograph) spectrograph ) and the NICMOS (Near Infrarred Camera and Multi-Object Spectrometer).
Unlike its predecessors, GHRS and FOS, which can observe a single point in space at once, the STIS spectrograph can observe a continuous line. This allows, among other things, to study the various speeds at which matter revolves around the center of a galaxy.
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