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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.
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Up close and personal with the sun As we experience the most intense summer heat this month, NASA is preparing to launch a hot, new mission to study the sun in great detail.
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