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International Space Station Expedition 10: 100 Days in Space

The Expedition 10 crewmembers are marking their 100th day in space today, ending a workweek focused on preparations for their first spacewalk Jan. 26.Commander Leroy Chiao and Flight Engineer Salizhan Sharipov are scheduled to leave the Pirs Docking Compartment airlock at 2:25 a.m. EST Wednesday. Most of their spacewalk tasks involve outfitting the outside of the Zvezda Service Module.