By the end of the year, Hayley Arceneaux will be the youngest American in space and one of the first tourists to enter orbit unaccompanied by professional astronauts. It is a feat made all the more remarkable by her battle to overcome a childhood cancer that robbed the 29 year old of her dream of becoming an astronaut herself. Due to the bone cancer she overcame, Arceneaux has steel rods in her left leg—which until recently were enough to shatter her hopes of going into space. Enter Jared Isaacman, a young American billionaire with a passion for space exploration who chartered a SpaceX Falcon 9 rocket at his own expense and decide...