A belt of material left over from this process remained in a region at the outer limits of the disk, in the form of small icy bodies. This region-the Kuiper Belt-is the source of "short-period" comets (with an orbital period of less than 200 years).
製造太陽及行星剩餘下來的小星體，環繞在太陽系最外圍，是形成短週期（小於兩百年）彗星的來源。