high res (0.9 M) low res (77 K)
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STS109-322-003 (6 March 2002) --- Astronaut Richard M. Linnehan, STS-109 mission specialist, participates in the third of five space walks to perform work on the Hubble Space Telescope (HST). The third overall STS-109 extravehicular activity (EVA) marked the second of three for Linnehan, who was joined by astronaut John M. Grunsfeld on them all. On this particular walk, astronauts Linnehan and Grunsfeld turned off the telescope in order to replace its power control unit or PCU--the heart of the HST's power system.
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