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The journey is being hailed as a major achievement despite failing to complete a core objective: docking at the international space station. NASA hopes to launch U.S. astronauts in space in 2020.
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Commercial companies SpaceX and Boeing are slated to launch astronauts to the International Space Station from US soil, a first since the retirement of the space shuttle. Delays have plagued the program and a government agency is asking NASA for a backup plan to get astronauts to the station.