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Pluto received a new designation in 2006 as a Dwarf Planet, formerly a planet but now listed in the Minor Planet Catalogue. It is also categorized as a Trans-Neptunian Object and sometimes called a Plutoid or Ice Dwarf.

Because of its distance from Earth it is hard to study - but in 2015 a probe should reach it and give more detailed information. At this time it is assumed to be composed of frozen gas like methane and nitrogen, with a thick layer of water ice, and likely have a rocky core.

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11y ago

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