Comet – Wikipedia

The solid, core structure of a comet is known as the nucleus. Cometary nuclei are composed of an amalgamation of rock, dust, water ice, and frozen carbon dioxide, carbon monoxide, methane, and ammonia. As such, they are popularly described as “dirty snowballs” after Fred Whipple’s model. However, some comets may have a higher dust content, leading them to be called “icy dirtballs”.

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Comet – Wikipedia

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