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[b]Expedition 65: U.S. Spacewalk 77 postponed[/b] The U.S. spacewalk outside the International Space Station originally planned for Tuesday (Aug. 24) with NASA astronaut Mark Vande Hei and JAXA (Japan Aerospace Exploration Agency) astronaut Akihiko Hoshide has been postponed due to a minor medical issue involving Vande Hei. This issue is not a medical emergency, [URL=https://blogs.nasa.gov/spacestation/2021/08/23/spacewalk-is-postponed/]according to NASA[/URL]. The spacewalk is not time-sensitive and crew members are continuing to move forward with other station work and activities. Teams are assessing the next available opportunity to conduct the spacewalk following the SpaceX CRS-23 cargo resupply launch planned for Aug. 28 and upcoming Russian spacewalks. Vandei Hei and Hoshide had been scheduled to install a support bracket, called a modification kit, on the inward port side of the space station's backbone truss structure in a position known as P4, which is closest to the station's pressurized living space. The kit will prepare the site for the future installation and deployment of the third of six new International Space Station Roll-Out Solar Arrays (iROSA) to upgrade one of the station's eight power channels known as 4A, which provides partial power to the U.S. Laboratory Destiny, the Harmony module and European Columbus module. The two spacewalkers were also expected to replace a device that measures the electrical charging potential of the arrays and associated surfaces in its vicinity, called a floating point measurement unit, on a separate truss.
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