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How large asteroids must be to destroy a city, state, country, or the planet

Scientists who study asteroids often say that Earth is drifting through a cosmic shooting gallery. Some angry space rocks, like the recent Chelyabinsk meteorite that exploded over Russia, are big enough to shatter windows and crumble walls. Others, like the one that caused the Tunguska Event of 1908, can flatten […]
How large asteroids must be to destroy a city, state, country, or the planet