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Comets are often described as 'dirty snowballs’. The solid centre, or nucleus, of a comet consists mostly office mixed with sooty material. The nucleus is quite small, and is usually only a few kilometers across.

Comets travel around the Sun in an elongated orbit. They plunge out into deep space beyond the farthest planet before diving back into the Solar System and passing dose to the Sun.

As the comet's nucleus comes closer to the Sun it becomes smaller and may eventually break up into read more...

Tags: comets, sun

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