Hi-Def Video Experience the space program like never before in stunning HD video! Shuttle mission STS-119 Take a loop around the International Space Station aboard the shuttle Discovery in stunning high definition.  FULL INDEX Launch of Kepler Kepler planet-finder begins its mission to discover Earth-like worlds orbiting other stars in the galaxy.  FULL INDEX LRO and LCROSS NASA's new lunar orbiter and impactor experiment are being prepped for launch in May.  FULL INDEX Delta 4 and GOES O A Delta 4 rocket has rolled out to launch a new geostationary weather satellite.  FULL INDEX Shuttle mission STS-126 High definition from orbit! New clips from Endeavour's mission to the space station.  FULL INDEX From the vault Historical footage from the early days of the space program.  FULL INDEX Become a subscriber More video		BY JUSTIN RAY Follow the countdown and launch of the Atlas 5 rocket carrying the Air Force's second Wideband Global SATCOM communications spacecraft. Reload this page for the latest on the launch. Sign up to our Twitter feed and get text message updates on your cellphone. U.S. readers can also sign up from their phone by texting "follow spaceflightnow" to 40404. (Standard text messaging charges apply.)