South Korea on Tuesday postponed a plan to launch a solid-fuel space rocket due to safety reasons, the defense ministry said, pushing back what would have been the first launch of a fully assembled four-stage vehicle. The Mir space rocket was scheduled to lift off at 2 p.m. from a sea barge off the southern coast of Jeju Island, but the launch plan will be rescheduled. "The planned launch of the solid-fuel space rocket has been canceled out of safety concerns as a set of issues was detected