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Siberian Blast Points to More Destructive Meteors Ahead

The idea that the orbiting chunks of interplanetary rocks called asteroids could hit the Earth and wipe out cities, or even life itself, is a familiar theme in space-based adventure films. But according to three just-released scientific studies in the journals Nature and Science, the likelihood that dangerous asteroids will enter Earth’s atmosphere may be greater than previously believed. On February 15 of this year, the world was inundated with dramatic video images of a 19-meter-wide...

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