Others can trigger global extinctions,But how big of an asteroid does it take to damage cities, states, countries, and the planet? Sign up for our newsletter to get the latest on the culture & business of sustainability — delivered weekly to your inbox. Some angry space rocks, like the recent Chelyabinsk meteorite that exploded over Russia, are big enough to shatter windows and crumble walls. A handful can trigger global extinctions, like the asteroid that smashed into Mexico's Yucatan Peninsula 66 million years ago. But how big of an asteroid does it take to damage cities, states, countries, and the planet?

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