According to the Twin study set up by NASA, the identical twins Scott and Mark Kelly were no longer identical twins when Kelly returned to th earth after spending the extended period in the international space station as part of the study. There were some positive results to the study, but most findings illustrated the determinental effects of living in space on human DNA.
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Earlier this year as part of their Twins Study, NASA issued a press release regarding preliminary results of the comparison between identical twin astronauts Scott and Mark Kelly. Scott Kelly spent a year in space (March 2015 to March 2016) aboard the International Space Station, and has spent a total of 520 days in space during his career, as opposed to a total of 54 days in space for his brother Mark. One of the ongoing investigations was the study...