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At a region between roughly 40 AU and 50 AU, the Kuiper Belt contains planetesimals thought to remnants of the protoplanetary disk in the early Solar System. There are 3 types of object which occupy the Kuiper Belt: Scattered Objects, Hot Classicals, and Cold Classicals.  Scattered Objects have highly eccentric and inclined orbits, not constrained to the 40-50 AU region, believed to be due to Neptune's early migration outwards when Jupiter and Saturn entered a 2:1 resonance. resonance, derived from the Nice Model.  This migration scattered the primordial Kuiper Belt which had occupied the region where Neptune orbits today. Hot Classicals are objects which were believed to have been scattered by Neptune but not to the extent of the Scattered Objects. These objects would've had their eccentricities and inclinations increased, but ultimately would find stable orbits within 2:3 and 1:2 resonances with Neptune, thus being deemed "Classical"  Cold Classicals are objects which are believed to be unaffected by Neptune's early migration, being formed between 40 Au and 50 AU with low eccentricities and inclinations, and remaining stable and unscattered except through self-interactions.