Maintenance on the International Space Station (ISS). Astronauts Jeffrey N. Williams (foreground) and Michael E. Lopez-Alegria working on the fluid servicing system installation in the Destiny laboratory of the ISS. Williams was the Expedition 13 NASA space station science officer and flight engineer, and Lopez-Alegria was the Expedition 14 NASA space station science officer and commander. The ISS is a joint effort by several national space agencies, including NASA. It orbits Earth at an altitude of around 350 kilometres. Photographed on 27th September 2006.
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