At CNN.com: Shortly after the U.S. response, the Pyongyang diplomat, Han Song Ryol, said six-nation talks were over and that the real issue is whether the United States intends to attack North Korea. North Korea has offically annouced that it has nuclear weapons for self defence. ----- How big of a threat is this? tommarrow, I will be 17. I plan on working at a nuclear power plant (What fields would I have to know in colleage for this?), and/or NASA. I'm really paranoid that North Korea will nuke us or japan, I thought I'd post it here because .. well the subject is Nuclear Engineering and you people seem to know alot about nuclear power. If korea did bomb us, what would it do? Would the bomb have enough power to wipe out a big city such as LA, or the entire country? How powerful would this bomb be? I know the basics of how a atomic bomb works, but I'd like to know more information.