Stock Photo - EARTH -- 18 Dec 2006 -- Astronaut Robert L Curbeam Jnr, STS-116 mission specialist, exits the Quest Airlock of the International Space Station as he and European Space Agency (ESA) astronaut Christer Fuglesang (out of frame), mission specialist, begin the mission's fourth session of extravehicular activity (EVA) while Space Shuttle Discovery was docked with the station. Curbeam and Fuglesang worked in tandem, using specially-prepared, tape-insulated tools, to guide the array wing neatly inside its blanket box during the 6-hour, 38-minute spacewalk -- Picture by Christer Fuglesang / Lightroom Photos.

Stock Photo: EARTH -- 18 Dec 2006 -- Astronaut Robert L Curbeam Jnr, STS-116 mission specialist, exits the Quest Airlock of the International Space Station as he and.