CAPE CANAVERAL, Fla. – A truck positions a Centaur upper stage inside the hangar at the Atlas V Spaceflight Operations Center at Cape Canaveral Air Force Station. The upper stage will be used as part of the Atlas V rocket that will be used to launch NASA's Magnetospheric Multiscale mission. To learn about the MMS, go to http://go.nasa.gov/1GUbzxb. Photo credit: NASA/Ben Smegelsky

A truck positions a Centaur upper stage inside the hangar at the Atlas V Spaceflight Operations Center at Cape Canaveral Air Force Station. The upper stage will be used as part of the Atlas V rocket that will be used to launch NASA's Magnetospheric Multiscale mission.