Safety concerns about getting a commercial crew vehicle away from the International Space Station in an emergency are driving NASA’s preferred design to a docking system instead of the grapple-and-berth linkup to be used on upcoming commercial cargo flights. William Gerstenmaier, associate administrator for human exploration and operations, says the U.S. space agency is building an advanced docking system that combines elements of U.S. and Russian technology and hopes to test it before ...


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