If we ever want to send people to visit Mars, we’re going to have to deal with one big problem: We don’t know what will happen to the human body there. Humans have never set foot on another planet before, and when they do, they will have to deal with strange conditions such as eating strange food, living in a tiny box, and regularly messing through miles of dusty desert in a spacesuit. If these future explorers were ever to get a chance…