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Nature 420, 294-296 (21 November 2002) | doi:10.1038/nature01238;

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The flux of small near-Earth objects colliding with the Earth

Asteroids with diameters smaller than |[sim]|50–100|[thinsp]|m that collide with the Earth usually do not hit the ground as a single body; rather, they detonate in the atmosphere. These small objects can still cause considerable damage, such as occurred near Tunguska, Siberia, in 1908.

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