NASA Twin Study
We see a decrease in body mass, an increase in inflammation, artery walls thicken, gene alterations and mutations can be triggered. People have also gotten taller due to the lack of gravity. This, however, goes back to normal when a person comes back to Earth. While we saw how it affected many in space, it was hard to note how much we changed. This was when a test was done to find a way to compare and contrast exact issues. NASA studied two twin men, where one of the twins went into space while the other twin stayed on Earth.
Mark and Scott Kelly both are obviously the same in several ways but would they look any different if one left the planet? Not only did Scott (space twin) show differences in his looks when he came back, but there were other big differences too. After spending near a year in space, Scott on just his appearance had gotten taller than his brother. In his face, he also looked younger than Mark. NASA also found several other differences between the two men after Scott returned. To learn more about this study, you can read NASA’s findings here.