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from | Encarta |  |
Asteroid and Comet Collisions |
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| In 1908 a comet or a stony asteroid with an estimated diameter of about 40 m (about 130 ft) exploded at an altitude of about 6 km (about 4 mi) above the Tunguska region of Siberia, Russia, flattening more than 1,000 sq km (400 sq mi) of forest, left. Meteor Crater, right, located near Flagstaff, Arizona, is a 1.13-km (0.7-mi) crater carved out 50,000 years ago by a metal asteroid about 50 m (about 150 ft) in diameter. | ||||||
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| Andrea Pistolesi/The Image Bank, Novosti Press Agency/Science Photo Library/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Asteroids, Comets, and Catastrophe; Crater; Tunguska Event; Asteroid | ||||||
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