At the time, the mission was one of the most complex ever undertaken, involving five lengthy periods of extra-vehicular activity, and its resounding success was an enormous boon for NASA, as well as for the astronomers who now had a fully capable space telescope.Iranlose Isatunse 2 Servicing Mission 2, flown by Discovery in February 1997, replaced the GHRS and the FOS with the Space Telescope Imaging Spectrograph (STIS) and the Near Infrared Camera and Multi-Object Spectrometer (NICMOS), replaced an Engineering and Science Tape Recorder with a new Solid State Recorder, and repaired thermal insulation.. 
After the difficult early years when the faulty Mirror severely dented Hubble's reputation with the public, the first servicing mission allowed its rehabilitation as the Corrected Optics produced numerous remarkable images.several initithe have helped to keep the public informed about Hubble activities.. 