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Spacewalkers Robert L. Satcher, Jr.(L) and Randy Bresnik work during their spacewalk outside the International Space Station in this image from NASA TV November 23, 2009. The spacewalkers are slated to transfer an oxygen filled High Pressure Gas Tank (HPGT) from the EXPRESS Logistics Carrier 2, located on the starboard truss, to a spot on the outside of the Quest Airlock. The tank will be used to replenish atmosphere lost when spacewalkers enter and exit the station. They will also install the seventh Materials International Space Station Experiment, or MISSE 7, which has the capability to use power from the ISS to transmit experiment data directly to Earth. REUTERS/NASA TV (UNITED STATES SCI TECH) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS Mon Nov 23, 2:06 PM ET

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