YouTube - Mass Shares Shuttle's "Close-Up"

In this episode of "NASA Behind the Scenes," astronaut Mike Massimino takes you up to - and under - the space shuttle as it waits on launch pad 39A at the Kennedy Space Center for the start of a recent mission. But first, learn about some of the very famous visitors to the virtual reality laboratory at the Johnson Space Center, as Mass takes you on a tour of this facility where astronauts train for and simulate spacewalks.