Astronaut twin Scott Kelly begins #YearInSpace: Why that long? (+video)

March 29, 2015 12:38 AM

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American astronaut and twin Scott Kelly is now aboard the International Space Station, beginning his one-year mission in space. How will this year affect him and his twin brother, and what will the implications be for future missions?

It’s official: The first American to spend a #YearInSpace has arrived.

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