Bodies and regions beyond the orbit of Neptune, including Kuiper Belt objects and the outer regions themselves where an entry describes the region rather than one discrete body. Belongs here: any object or named region whose defining location is trans-Neptunian, not yet massive enough or not confirmed as a dwarf planet. Does not belong here: confirmed dwarf planets in this same region, such as Pluto and Eris, grouped under Dwarf Planets, since dwarf-planet status is the more specific and more useful grouping once a body has been confirmed.
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Sources
1. Wikipedia: Trans-Neptunian object
Wikimedia FoundationTrans-Neptunian object, lead sectionQuote, Trans-Neptunian object, lead section
The first trans-Neptunian object to be discovered was Pluto in 1930.
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