Scientists say that the asteroid that exploded over Chelyabinsk, Russia this past February was a rare event, unlikely to happen more than every 100 -200 years. But a recent paper in the scientific journal Nature said the earth should expect and plan to get hit by Chelyabinsk-sized asteroids more often-- maybe every decade or two.
This news sparked a flurry of talk about what that means for us on earth. How vulnerable are we and are we doing enough to detect and deflect asteroids?
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