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It seems to me that nowadays the more proper term is "Trans-Neptunian Object". Is there any difference between Kuiper Belt Objects and Trans-Neptunian Objects? If not, is one term preferred over the other?

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Yes there is a difference, Kuiper Belt Objects (KBOs) are a subset of Trans Neptunian Objects (TNOs). Other subsets are Oort-cloud objects (OCOs) and scattered disk objects (SDOs). These are not KBOs but they are TNOs. See for instance this wikipedia page.

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So to refer to objects beyond Neptune you use 'trans-Neptunian objects'. It really sounds simple, there are several sub-sets of trans-Neptunian objects: referring to minor-planets (neither Planets nor comets) that exist in this region of the Solar System.

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