They calculate that the impact of a body 250 kilometers wide would have delivered energy equivalent to 100 billion megatons of tnt to the planet , melting exposed polar ice and injecting enough water into the atmosphere to rain out 16 meters of precipitation 研究人员推算，直径250公里的星体对火星的冲击能量相当于1000亿个百万吨黄色炸药，足以融化裸露的两极冰帽，将大量的水带入大气，造成16公尺的降雨量。
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Some weapons designers have argued that low - yield earth - penetrating nuclear arms , with explosive yields ranging from the equivalent of 10 to 1 , 000 tons of tnt , would provide unique tactical and strategic capabilities while minimizing unwanted collateral effects ? in particular , the atomic fallout typically generated in abundance by more powerful bombs 某些武器设计者表示，爆炸当量相当于10 ~ 1000吨黄色炸药的低当量钻地核弹，具备独特的战术及战略功能，并可将副作用减到最低，尤其是降低威力较大的核弹通常会在周围造成的原子落尘。
