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Astronaut’s record orbit concludes with safe return
Astronaut Scott Kelly spent 340 days -- the longest an American has ever been in space -- on the International Space Station before descending into Kazakhstan by capsule Tuesday evening. Kelly’s extraterrestrial sojourn was part of a study on the long-term effects of space on the human mind and body. NASA plans to put astronauts on the two-and-a-half year trip to Mars within two decades.
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