Every year, thousands of asteroids sneak into our atmosphere, breaking up into smaller rocks that sometimes make it all the way to the ground. Most of the time, they go unnoticed, but once in a while, a big one gets through-like the doozy that wiped out the dinosaurs 65 million years ago, or, more recently, the one that exploded over Peru in September of 2007. According to NASA, there are an estimated 20,000 asteroids near Earth that could devastate regions of our planet; however, the agency has only identified a small fraction of them.moreless
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