NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Hubble Telescope servicing. Astronauts perform an ExtraVehicular Activity (EVA or "spacewalk") during a space shuttle mission to service the Hubble Space Telescope (HST). Astronauts Steven Smith (at centre) and Mark Lee (perched on the Remote Manipulator System robot arm) are inspecting the hand rails on the HST. Photographed in the cargo bay of the Discovery shuttle during mission STS-82 (11-21 February 1997). This mission was the second to service the HST since its launch in 1990. Five EVAs were performed to add improved instruments and replace some aging components. The shuttle also lifted the HST into a slightly higher orbit.
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