Study of twin astronauts reveals effects of spaceflight on the human body

Researchers said that after Scott Kelly spent nearly a year in orbit, his DNA mutated some cells and cognitive test scores dropped - and have not reversed.
0:19 | 04/11/19

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Transcript for Study of twin astronauts reveals effects of spaceflight on the human body
NASA study tonight comparing twin astronaut Scott and mark Kelly and revealing. But the effects of space flight do occur on the human body researchers say after spending. Nearly a year in orbit Scott Kelly's DNA mutated in some cells and his cognitive test scores dropped. NASA says this will not affect though future long term space missions.

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