Neptune’s gravitational effect does not really affect the Kuiper Belt, so the articles at hand can continue unchanging in their orbits. The regions substances are involved in what are identified as Trans-Neptunian Objects (TNOs).  Trans-Neptunian Objects orbit further from the Sun than Neptune. Even though a lot of comets are believed to have derived from the Oort Cloud, various do originate from the Kuiper Belt.  Sedna is another object in the Kuiper Belt which is about three fourths the size of Pluto and was exposed in 2004. It takes about 10,500 years to make a lone orbit because it so far away from the sun. 

Considerable amounts of gas, dust and rocks came together to develop the sun and planets, when the solar system was made. The majority of the remaining debris was brushed into the sun or out of the solar system.  Objects farther out stayed safe from gravitational pulls of planets like Jupiter, and so succeeded to stay unharmed as they gradually orbited the sun. The Kuiper Belt and its neighbor, the further withdrawn and circular Oort Cloud, hold the excess remains from the start of the solar system and can deliver respected perceptions into its birth.

http://www.universetoday.com/32515/

http://www.space.com/16144-kuiper-belt-objects.html