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  Tuesday, September 17, 2019
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Bill McArthur and Valery Tokarev will leave the station unattended inside, as they float out of the U.S. module attached to tethers
U.S. Station commander Bill McArthur and Russian flight engineer Valery Tokarev will leave the station unattended inside, as they float out of the U.S. module attached to tethers. The U.S. and Russian space agencies prefer a third crewmember to remain inside to help the spacewalkers in and out of their bulky spacesuits and oversee their outside activities. But there has not been a third person aboard the station since the moratorium on shuttle flights after the Columbia disaster in 2003. This is because Russian cargo craft are not large enough to carry enough supplies for a trio. So, flight controllers on Earth will run the station during their spacewalk, or, as mission directors call it, an EVA for extra-vehicular activity. The lead U.S. flight controller is Sally Davis. "This is not the first EVA that we've been a part of without anyone inside. We've actually done several of them out of the Russian segment," said the lead U.S. flight controller Sally Davis. "It is the first time we've done a U.S. EVA without anyone inside," reports Voice of America. According to Reuters, NASA next week will direct its first spacewalk in 2-1/2 years by International Space Station crewmembers, space agency officials said on Thursday. The spacewalk set for Monday will be the first under NASA's full control since a glitch in the cooling system contaminated U.S. spacesuits and the U.S. airlock aboard the orbital outpost. Crewmembers fixed the airlock, but until a U.S. space shuttle could deliver new U.S. spacesuits, spacewalkers had to use Russian suits, which can only be serviced in the Russian airlock. Moscow oversees spacewalks from its airlock. New U.S. spacesuits arrived during July's mission to the station by the shuttle Discovery, the only shuttle flight since Columbia burst apart over Texas in 2003
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