When you hear the word meteor, you probably think of so-called shooting starsthe streaks of light that zip across the night sky when a small bit of space debris, usually no bigger than a grain of sand, speeds through Earth's atmosphere and burns up because of friction with air molecules.If you have a more catastrophic bent, you might think of the bigger chunks of stuff that blow apart during their passage, generating powerful shock waves: A good example is the one that exploded above Chelyabinsk, Russia, in early 2013, injuring about 1,500 people and damaging thousands of buildings.
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