ROUGH CUT (NO REPORTER NARRATION)<br/> <br />An unmanned U.S. spaceship designed to one day fly astronauts to Mars blasted off on Friday for an unmanned trial run around Earth.<br/> <br />A Delta 4 Heavy rocket, currently the biggest booster in the U.S. fleet, lifted off at 7:05 a.m. Eastern time from Cape Canaveral Air Force Station in Florida.<br/> <br />United Launch Alliance, a partnership of Lockheed Martin Corp and Boeing Co that builds and flies the rocket, delayed launch by one day to resolve a problem with sluggish values in the rocket's first-stage propellant system.<br/> <br />Riding atop a fountain of fire, the 24-story-tall rocket soared out over the Atlantic Ocean, punching through partly cloudy skies as it headed into orbit.<br/> <br />Cars jammed roads for miles around the spaceport as thousands of people attempted to catch a glimpse of the launch. The last time crowds this large gathered for rocket-watching was for the space shuttle, which stopped flying in 2011.<br/> <br />NASA has been working on
