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Malenchenko has now spent 642 days in space, making him the sixth most experienced space traveler in history. Williams has a spent a total of 322 days in space over two missions. She and Hoshide conducted a crucial spacewalk earlier this month to work on a leaky radiator system outside the space station. That took Williams' total cumulative spacewalk time to 50 hours and 40 minutes
-- a record for a female astronaut. NASA says the returning expedition conducted a range of scientific experiments while at the space station, included testing radiation levels on the orbiting outpost, assessing the effects of microgravity on the spinal cord, and investigating melting glaciers, seasonal changes and human impacts on the ecosystem. The crew was to be taken to the town of Kostanai, from where Williams and Hoshide would board a Gulfstream jet for a trip to Houston, Texas, while Malenchenko was to return to a Russian space facility outside Moscow. NASA footage showed celebrating recovery workers at the landing site erecting a sign marking the successful touchdown.
[Associated
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