Spaceflight Now + Premium video content for our Spaceflight Now Plus subscribers. Launch of X-43A NASA's X-43A hypersonic aircraft is launched to Mach 10 by a Pegasus rocket booster where the experimental scramjet engine is tested during this third flight of the Hyper-X program. (3min 51sec file)  Play video Success for X-43A Mission officials recap the successful flight of NASA's third and final X-43A hypersonic research vehicle during this post-launch news conference. (39min 25sec file)  Play video X-43A launch preview NASA officials preview the third and final test launch of the X-43A hypersonic vehicle during this news conference from Dryden Flight Research Center. (29min 47sec file)  Play video Deep Impact arrives NASA's Deep Impact comet spacecraft arrives at the Astrotech Space Operations Facility near Kennedy Space Center to begin final launch preparations for blastoff December 30 aboard a Boeing Delta 2 rocket. (2min 53sec file)  Play video Veterans Day Aboard the International Space Station, commander Leroy Chiao offers his thoughts in this downlinked message in honor of Veterans Day.  Play video Delta rocket lofts GPS The Boeing Delta 2 rocket lifts off Saturday morning with the GPS 2R-13 satellite from pad 17B at Cape Canaveral, Florida.  Play video Launch in full This longer-length clip follows the Delta 2 rocket during its late-night ascent carrying the latest Global Positioning System satellite. (2min 25sec file)  Play video Become a subscriber More video NewsAlert Sign up for our NewsAlert service and have the latest news in astronomy and space e-mailed direct to your desktop. Enter your e-mail address: Privacy note: your e-mail address will not be used for any other purpose.		BY SPACEFLIGHT NOW Follow the third and final launch of NASA's X-43A hypersonic program using a Pegasus first stage booster. Reload this page for the very latest on the mission.