Astronaut Jeffrey Hoffman during Shuttle Mission STS-61. One of the tasks on this servicing flight was to replace the Wide Field and Planetary Camera (WF/ PC) with a new version. The new camera has improved detectors as well as a new optics system to allow for the fault in the HST' s main mirror. Five spacewalk shifts were performed to conduct all of the servicing tasks required. Mission STS-61 flew on 2-13 December 1993. (Photo by NASA/Science Photo Library)
