“So the way you rendezvous with the space craft is you kind of get underneath it and sneak up on it,” says astronaut Mark Kelly. You’re moving through millions of miles of cubic space, traveling at 17,500 miles per hour and your margin of error is just inches.

Scott Kelly isn’t only an astronaut- he’s also a father to two daughters. His eldest, Samantha, recounts what it’s like to have a spaceman for a Dad.

For astronauts, blast off can be an out-of-control experience – strapped into a huge controlled explosion.

Over the course of his year in space, astronaut Scott Kelly will conduct over 400 experiments – everything from fluid dynamics to zero gravity farming. But the primary experiment is on himself -- investigating the long-term effects of space travel on the human body.