How likely is a terrible asteroid impact in our lifetime?

Off the baking Interstate 40 in Arizona, the evidence is clear: From time to time, sizable asteroids do pummel Earth. There, you’ll find the 600-foot-deep “Meteor Crater,” which landed 50,000 years ago. The culprit was likely some 100 to 170 feet across, creating a blast big enough to destroy Kansas City…
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