Nasa spacex crew 4

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ember 2021, I don't have specific information on a "NASA SpaceX Crew 4" mission. However, SpaceX and NASA have been collaborating on Crew Dragon missions to the International Space Station (ISS). To get the most up-to-date information on SpaceX Crew missions and their crews, I suggest visiting the official SpaceX or NASA websites or checking recent news sources for the latest details on space missions and crews.