The Friday venture by Oleg Kotov and Sergei Ryazansky is the third spacewalk in a week at the orbiting laboratory. U.S. astronauts Rick Mastracchio and Michael Hopkins performed two on Saturday and Tuesday to remove and replace a faulty cooling pump.
The Russians' tasks on their spacewalk, which is expected last about seven hours, include installing two high-resolution cameras and attending to experiment equipment on the space station's exterior
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