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So, we know that Tunguska was a huge explosion in Siberia, probably from a meteorite or comet. It flattened everything within 25 km, and the glow from it was visible around the world during sunset. But what would have happened if the comet entered the atmosphere 7 or 8 hours later? If it had done so, the planet's rotation would have placed the comet over Western Europe. What would have happened if the comet had exploded over a large city such as London or Paris?
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