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Spending 340 days aboard the International Space Station between 2015 and 2016 caused changes in astronaut Scott Kellys body, from his weight down to his genes, according to the results of the NASA Twins Study published Thursday in the journal Science. The majority of changes that occurred in Kellys body, compared with his identical brother, Mark, on Earth, returned to normal once he came back from the space station. The study results suggest that human health can be "mostly sustained" for a year in space, the researchers said.
The molecular, physiological and behavioral changes were divided into low-, mid-level and high-risk groups. Scotts change in body mass and microbiome were considered low-risk. Shifts in collagen regulation and blood vessel fluid management were mid-level, and genomic instability was regarded as potentially high-risk… (CNN, April 11, 2019)