NASA hopes to use commercial vehicles to match the cost of flying astronauts to the International Space Station on Russian Soyuz vehicles or to do slightly better. But even if U.S.-built commercial vehicles are ready to fly crews in 2016 as planned, the agency probably will need a longer exemption on the law that otherwise would keep it from doing business with Moscow. William Gerstenmaier, associate administrator for human exploration and operations, told the House Science Committee ...

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