Standing down on tonight's attempt to launch. As I've said before, @NASA 's first priority is safety. We go when we're ready.
Having a second option for trips to the International Space Station (ISS), in addition to SpaceX's Dragon vehicles, has been a NASA priority ever since its last mission in 2011.
The craft will be sent into orbit by an Atlas V rocket made by United Launch Alliance, a Boeing-Lockheed Martin joint venture.
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