STS061-87-046 (5 Dec 1993) --- Astronauts Jeffrey A. Hoffman (right) and F. Story Musgrave work near the base of the Hubble Space Telescope (HST) on the first of five spacewalks. Their particular mission here is to replace failed Rate Sensor Units (RSU) inside the telescope's housing. Hoffman is anchored to a foot restraint, mounted on the end of the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm, while Musgrave is standing on a foot restraint attached to a support structure in the cargo bay.