Astronaut Scott Kelly's One Year Mission and the Twin Study

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The longest American space voyage ever is now over and scientists are about to swarm over Scott Kelly. When the astronaut touched down yesterday in Kazakhstan, he set a record for the longest spaceflight by an American. Kelly now holds the record of 340 days in space… and comparison with his twin brother, former astronaut Mark Kelly, offers a unique opportunity. We hear what's in store for Kelly and from America's former record holder.

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Two thumbs up from NASA Astronaut Scott Kelly, resting in a chair outside of the spacecraft just minutes
after he landed in Kazakhstan on Wednesday, March 2, 2016 (Bill Ingalls/NASA)

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Astronaut twins Mark Kelly and Scott Kelly