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NBC News' space expert answers questions about North Korea's satellite launch

The five-day window for the launch of a North Korean rocket mounted with an observation satellite opened Thursday as the rest of the world waits to see if Pyongyang will defy international warnings and go ahead with the controversial mission.

NBC News is in North Korea to observe the launch with space expert James Oberg. With a 22-year career as a space engineer in support of NASA’s spaceflight operations, Oberg has the experience and technical expertise to determine the veracity of North Korea’s claims about this mission.

Oberg answered reader questions for an hour earlier today. The questions and answers were extremely engaging and informative.

Click below to replay the chat.

Read some of Oberg's reports on North Korea's space program:

What happens if North Korea's satellite fails?

North Koreans desperate for Western approval of launch

North Korea's 'unconvincing' answers to satellite questions

NBC space expert on North Korea satellite launch: 'It's not a military missile...but it's darn close'