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A 53 megaton thermonuclear bomb let off by the Soviets in 1961. The most powerful weapon ever detonated by humanity, several thousand times as powerful as the Hiroshima bomb. Its mushroom cloud went 64km high, and the blast wave went around the earth a few times. It broke windows over 1000km away. For the brief period of the explosion it produced 1.4% of the power output of the sun. It annihilated everything within 30 miles, turning rock to ash etc., and smashed the living crap out of everything within 100 miles.
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