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STS103-731-051
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STS103-731-051

June 16, 2011
Astronauts C. Michael Foale (left) and Claude Nicollier participate in the second of three STS-103 spacewalks to service the Hubble Space Telescope (HST). On this task they are replacing one of the telescope's Fine Guidance Sensors (FGS). Nicollier, a European Space Agency (ESA) astronaut, is standing on the end of the remote manipulator system (RMS).