SEOUL, Aug 24 (Reuters) - North Korea appears to have made progress in its space program, despite a second rocket failure on Thursday, but its unusually quick launch pace may be causing problems, analysts said. North Korea's second attempt to place a spy satellite in orbit failed after the booster experienced a problem with its third stage, state media reported. South Korea scheduled nearly a year between each of the three launches of its new Nuri rocket, none of which failed as spectacularly as the North Korean attempts. North Korea plans to launch the Chollima-1 three times in less than six months. "I am not sure if North Korean leadership knows the characteristics of large-scale science," he said.

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Persons: Jeffrey Lewis, James Martin, Chang Young, Kim Jong, Yang Uk, Nuri, Yang Moo, Kim, Lee Choon, Hyonhee Shin, hyang Choi, Josh Smith, Gerry Doyle Organizations: James, James Martin Center, Nonproliferation, Korea Aerospace University, Asan Institute, Policy Studies, University of North Korean Studies, South Korea's Science, Technology Policy Institute, Thomson Locations: SEOUL, North Korea, South Korea, Pyongyang, Seoul, Korea, Korean