STS-125 Mission Specialist 1 (MS1) Michael Good (diagonal red stripes) and MS4 Mike Massimino (partially visible behind Good) work behind the Hubble Space Telescope's (HST) +V2 aft shroud doors to repair the Space Telescope Imaging Spectrograph (STIS) during the fourth session of Extravehicular Activity (EVA4). Good is standing on the Shuttle Remote Manipulator System (SRMS) Manipulator Foot Restraint (MFR).
