The US space agency is investing $170m (�340m) in Orbital Sciences Corporation to help the firm develop a commercial resupply ship for the space station.The Cygnus spacecraft would take food, water, air, fuel and equipment to the orbiting platform. A demonstration flight is expected in late 2010.
Nasa needs logistics support for the ISS while it produces a successor to the space shuttle.
It plans to hand routine low-Earth operations to the private sector.
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