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    Solar system Definition, Planets, Diagram, Videos, Facts Britannica
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    Asteroids are small, rocky bodies that orbit the sun. They are also called minor planets or planetoids. Here are some key points about asteroids:
    • They are materials left over from when the planets formed.
    • They can be created when other bodies in space collide and break apart.
    • Asteroids are made of rock and metal, and some contain organic compounds.
    • They are similar to comets but do not have a visible coma like comets do.
    • Asteroids range in size from smaller than a car to 600 miles across.
    • Most of them lie in a doughnut-shaped "main belt" between the orbits of Mars and Jupiter.
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