Meteor explosions like this year’s Russian fireball more common than thought

Chelyabinsk-sized rocks may come to Earth every 30 years, on average

By Andrew Grant, 13:16 PM November 6, 2013

Meteor impacts such as February’s explosion over Chelyabinsk, Russia, the most powerful observed in a century, may occur more frequently than thought. An analysis of recorded impacts over the past two decades suggests that Chelyabinsk-sized objects strike the planet every few decades, on average, rather than once every century or two.

“There were inklings of this before, but this is the strongest statement that’s been made,” says Paul Chodas, a planetary scientist with NASA’s Near Earth Object...

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