OK, if you are that curious, I will tell you: Nuclear weapons are prohibited under Galactic Law because they create a wave which disrupts space time. When these weapons were used, your planet was contacted and warned but attacked the representatives and refused to obey. Therefore, it was declared a threat to Galactic security and the Galactic police were called in. In their investigation, they learned by scanning the population that most had no Soul - which is another violation. You people believe that the Universe is an accident and that you are here because lightning struck a rock or some similar nonsense and the rest of the Universe is empty. Actually, the Universe is heavily populated and there are laws you must obey. The Galactic Police enforce these laws and have now been authorized to destroy this planet unless you learn to behave yourself. Since there is no indication that you intend to do this, whatever action is deemed appropriate will be taken. In 1992, the Galactic Police - in less than three days - neutralized all nuclear weapons on this planet. They won't work anymore. However, like any police agency, they then looked for evidence of other crimes and discovered the orphan life forms. If you had not been so stupid and had not used nuclear these weapons - which create waves which travel far beyond this solar system and can be detected and traced to their source - you would likely not have been discovered. However, now that you have been, the appropriate corrective measures will be taken and you cannot win against the Galactic Police so this is the end of the world as you have known it - satisfied?