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| Boeing |
We now have a much clearer idea of how American astronauts will get into orbit in the coming years.
Nasa has selected three companies to help develop launch systems that can take people to the space station.
They include the SpaceX firm, which recently sent an unmanned cargo capsule to the 400km-high outpost.
But agreements have also been signed with aerospace giant Boeing and the Sierra Nevada Corporation. The latter has a design for a mini-shuttle.
BBC News: NASA announces space shuttle replacement shortlist
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