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| STS-109 Shuttle Mission Imagery | |
 high res (1.3 M) low res (124 K) |
STS109-322-025 (1-12 March 2002) --- A close-up view of the power control unit or PCU, which is the heart of the Hubble Space Telescope (HST) power system. Astronauts John M. Grunsfeld and Richard M. Linnehan, STS-109 payload commander and mission specialist, respectively, replaced the PCU on March 6, 2002, during the third space walk of the mission. |
