Experts were 'surprised' by some of the changes experienced by astronaut Scott Kelly, who spent a record 340 days in space.
But it doesn't mean Kelly got younger while in space, as once back on Earth his telomeres mostly returned to pre-flight length, although he did have more short telomeres than before.Susan Bailey, a telomeres expert from Colorado State University said:"We were surprised."
Geneticist Christopher Mason, who co-authored the study, said Scott's immune system genes were especially affected, as if it was put"almost on high alert as a way to try and understand this new environment".
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