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(NECs). A number of solar-orbiting meteoroids were large enough to be tracked in space before striking Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of Earth. Asteroids as small as 20 m in diameter can cause significant damage to the local environment and human populations around the position of their impact. Larger asteroids penetrate the atmosphere to the surface of the Earth, producing craters if they impact a continent

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