Transcription: Jeff Hoffman and Story Musgrave ventured out of Endeavour's airlock for the third servicing spacewalk and the first devoted primarily to the improvement of Hubble's vision. Hoffman and Musgrave first worked to remove the old model of the Wide Field and Planetary Camera from a compartment in the telescope, carefully sliding it out on guide rails. The camera is responsible for half of the scientific observations Hubble makes of distant astronomical targets. To get the feel for the mass of the 600-pound and its twin upgraded model to be installed in the same cavity, Hoffman practiced the reinstal ...
(.mp4)