▁continues ▁into ▁the ▁K ui per ▁bel t , ▁the ▁scattered ▁disc , ▁and ▁the ▁O ort ▁cloud , ▁three ▁sparse ▁populations ▁of ▁small ▁ icy ▁bodies ▁thought ▁to ▁be ▁the ▁points ▁of ▁origin ▁for ▁most ▁observed ▁com ets . ▁At ▁their ▁distance ▁from ▁the ▁Sun , ▁acc ret ion ▁was ▁too ▁slow ▁to ▁allow ▁plan ets ▁to ▁form ▁before ▁the ▁solar ▁ne b ula ▁dispers ed , ▁and ▁thus ▁the ▁initial ▁disc ▁lack ed ▁enough ▁mass ▁density ▁to ▁cons olid ate ▁into ▁a ▁planet . ▁The ▁K ui per ▁bel t ▁lies ▁between ▁ 3 0 ▁and ▁ 5 5   AU ▁from ▁the ▁Sun , ▁while ▁the ▁farther ▁scattered ▁disc ▁extends ▁to ▁over ▁ 1 0 0   AU , ▁and ▁the ▁distant ▁O ort ▁cloud ▁begins ▁at ▁about ▁ 5 0 , 0 0 0   AU . ▁Origin ally , ▁however , ▁the ▁K ui per ▁bel t ▁was ▁much ▁dens er ▁and ▁closer ▁to ▁the ▁Sun , ▁with ▁an ▁outer ▁edge ▁at ▁approximately ▁ 3 0   AU . ▁Its ▁inner ▁edge ▁would ▁have ▁been ▁just ▁beyond ▁the ▁or bits ▁of ▁U ran us ▁and ▁Ne pt une , ▁which ▁were ▁in ▁turn ▁far ▁closer ▁to ▁the ▁Sun ▁when ▁they ▁formed ▁( most ▁likely ▁in ▁the ▁range ▁of ▁ 1 5 – 2 0   AU ), ▁and ▁in ▁ 5 0 % ▁of ▁simulations ▁ended ▁up ▁in ▁opposite ▁locations , ▁with ▁U ran us ▁farther ▁from ▁the ▁Sun ▁than ▁Ne pt une . ▁ ▁According ▁to ▁the