DAVID A. HARDY / SCIENCE PHOTO LIBRARY DAVID A. HARDY / SCIENCE PHOTO LIBRARY
Artist's impression of an asteroid on a collision course with Earth. Most of the asteroids lie in well-defined belts between the orbits of Mars & Jupiter, but some of them have eccentric orbits. Many asteroids & large meteorites have struck Earth in the past & it is inevitable that others will do so in the future, potentially causing enormous devastation.
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