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Between Mars and Jupiter, and also beyond Pluto, there are hundreds of thousands of small bodies called asteroids.
Their diameter varies between a few metres to more than 1000 km.
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More spectacular are the comets, small bodies, generally less than 100 km. in diameter, formed mostly of ice. When they get near to the sun they unfurl a tail which makes them famous.
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| We can see how they move by clicking on Comet.
Today we assume that the comets are the remains left after the
formation of the solar system, which makes it very interesting to study
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