Twin astronauts to help NASA learn about zero gravity

May 29, 2014 10:42 AM

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Once his journey is completed, Scott Kelly will set a record as the longest American in orbit.

For the first time, NASA will be conducting a study on identical twins to compare the effects of weightlessness on the body. While retired astronaut Mark Kelly, 50, will stay home on Earth, his brother Scott will be spending a year aboard the International Space Station beginning next spring.

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