Launch of SpaceX Falcon rocket aborted seconds before liftoff

By Irene KlotzCAPE CANAVERAL, Fla. (Reuters) - SpaceX called off the planned launch of a Falcon 9 rocket from a historic launchpad in Florida seconds before liftoff on Saturday to investigate a potential problem with the steering system in the upper stage of the booster.The flight, the first for the company from a launchpad at the Kennedy Space Center once used for NASA's space shuttle program, was rescheduled for 9:38 a.m. local time (1438 GMT) on Sunday.The rocket will carry a cargo ship bound