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What are comets made of?

Comets may be composed of many different things, depending on their origins, but many contain large quantities of ice Of the other contents, there may be metals such as iron, iridium, and other minerals. Trapped in the ice, moreover, there may be samples of gasses, if the comet came from some planetary form or if it passed through a gaseous cloud. The tail of the comet is simply a stream of evaporating water and gasses from its surface.


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