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Astronaut Scott Kelly's genes show long-term changes after a year in space02:12
Scott Kelly’s DNA was altered by his year in space, NASA says02:40
Elon Musk says SpaceX will be ready with its Mars rocket by next year01:30
Elon Musk says SpaceX rocket may fly to Mars next year02:53
Astronaut Scott Kelly on spending a year in space: ‘It’s hard to sleep’05:15
SpaceX launches largest satellite into space (it’s nearly the size of a bus)00:28