It seems like pure science fiction. NASA astronaut Scott Kelly goes to space for nearly a year, comes back, and suddenly has turned into a mutant with different DNA from his twin. As Newsweek wrote, his DNA "changed in space".
After recent events, we're all ready to hop aboard the next flight to Mars. But before us Earthlings embark on a seven-month journey to the Red Planet, we need to understand how the harsh conditions of space can affect our bodies.