How is a Kuiper Belt Object (KBO) fundamentally defined by its orbital path?
Answer
A KBO is defined as any small solar system body whose orbit primarily resides outside of Neptune's path.
The classification of an object as a Kuiper Belt Object (KBO) is based specifically on its orbital mechanics relative to the solar system’s structure, rather than just its composition or size alone. The defining criterion is its average orbital location. If the vast majority of an object's trajectory keeps it outside the influence of Neptune's primary gravitational domain—meaning its orbit primarily resides beyond Neptune's path—it is categorized as a KBO, regardless of whether it is a small icy body or a large dwarf planet like Pluto or Eris.
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