NASA will pay Russia $70.7 million a passenger to train and transport another six crewmembers to the International Space Station, under the latest modification to its Soyuz transportation services contract with the Russian space agency. The add-on will run through 2017, when NASA hopes to begin sending U.S.-built commercial crew vehicles to the ISS. But a showdown is brewing between Congress and the White House over how much NASA can spend to spur a commercial U.S. route to the ISS.


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