When it comes to comet impacts, the denizens of Earth may be living on borrowed time. Of course, comets are only about half the problem — there are plenty of asteroids whizzing around the inner solar system too — so we decided to have a look and see just how close modern society has come to destruction since 1900, and how close we're going to come over the next 100 years. The answers, provided in our nifty infographic, aren't reassuring.
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