Rock and Roll, Discovery!

Space shuttle Discovery launched on-time at 7:43 p.m. EDT and NASA flight managers confirmed mai

n engine cutoff. The shuttle has reached orbit, flying at 17,500 miles per hour.

Commander Lee Archambault will lead Discovery's crew of seven, along with Pilot Tony Antonelli, and Mission Specialists Joseph Acaba, John Phillips, Steve Swanson, Richard Arnold and Japan Aerospace Exploration Agency astronaut Koichi Wakata on mission STS-119 to the International Space Station.

The Discovery crew members are set to fly the S6 truss segment and install the final set of power-generating solar arrays to the International Space Station. The S6 truss will complete the backbone of the station and provide one-fourth of the total power needed to support a crew of six.