Space ShuttleNASA launches Space Shuttle Discovery on the 64th flight of the shuttle program. The cargo bay carries an experiment to test LIDAR applications from orbit, and is the site of a six-hour spacewalk to test an alternative to the retired MMU “jet pack” for EVA rescue purposes. Aboard Discovery for her 19th mission are Commander Richard Richards, Pilot Blaine Hammond, and mission specialists Jerry Linenger, Susan Helms, Carl Meade and Mark Lee.