One Twin Went To Space For a Year, When He Came Back The Changes Were Compelling

A Unique Study

The Mark-Kelly Twins study was a game-changer for NASA. It was the first time the space organization could really dissect what happens to a person at the genetic level and up when spending a year in space. The research will have a profound impact on future space missions given what it highlighted for scientists about what can happen to the body in space.