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本文对两种自然爆炸灾害——天体对地球的撞击和空间碎片对航天器的撞击进行了分析，指出了这种自然灾害发生的概率及危害特性，探讨了预防灾害的可能方案。
In this paper, two kinds of natural explosion disaster, the impact of the celestial body on the earth and the impact of the space debris on the spacecraft, are analyzed. The probability and the harmfulness characteristics of the natural disasters are pointed out and the possible solutions to the disaster prevention are discussed.