Currently only Russia is providing International Space Station crew transport with its Energia Soyuz spacecraft. NASA's Discovery flight STS-128, launched on 28 August, was the last scheduled Shuttle-based ISS crew rotation. And after the Shuttle fleet retires in 2010 ISS will rely on the cargo spacecraft of ESA, Russia and Japan until NASA's commercial providers - Space Exploration Technologies and Orbital Sciences - begin. If any of these are delayed or fail then station research could become very limited and its crew of six could have to be reduced to three.
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