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I apologize in advance for the use of bad English in the title, I couldn't think of the best way to word it.
The Tunguska Event, as I'm sure most of you know, was a meteor or comet that burst in the air in Siberia, on June 30, 1908. But what if that meteor/comet had instead blew up over a more populated area, like London? What would the immediate response and future be?
In case you do not know what the Tunguska event is, here is a Wikipedia link.