The two-stage Naro rocket, kept earthbound through four years of delays, launched from South Korea's space center on Oenaro Island, 290 miles south of Seoul, following an aborted attempt last week resulting from a technical glitch in one of the launch vehicle's high-pressure tanks. The rocket, built with Russian assistance, was carrying a South Korean-made satellite. For reasons that are still unclear, the satellite separated from the rocket at an altitude of 220 miles. The two were intended to separate just shy of 190 miles. Russian scientists are working with the South Koreans to diagnose the problem.