Because the rocket used was designed as a nuclear capable missile. Depending on the warhead it has a range of up to 9000 miles. It's capable of
putting a small satellite into a 250 mile orbit.
Oh look! The LOCAL NEWS here just showed a video released by North Korea of the missile launching. Along with the release of satellite pictures of
the launch.
What did I say the other day? Hmm? Did I not say they would release them? Sure looked real to me.