(Reuters) - A U.S. spaceship designed to one day fly astronauts to Mars blasted off on Friday for an unmanned trial run around Earth. A Delta 4 Heavy rocket, currently the biggest booster in the U.S. fleet, lifted off at 7:05 a.m. EST (1205 GMT) from Cape Canaveral Air Force Station in Florida.
(Reporting by Irene Klotz)
