The Kuiper Belt is a disc-shaped region of icy objects beyond the orbit of Neptune -- billions of kilometers from our sun. Pluto and Eris are the best known of these icy worlds. There may be hundreds more of these ice dwarfs out there. The Kuiper Belt and even more distant Oort Cloud are believed to be the home of comets that orbit our sun.
Featured Mission: New Horizons
NASA's New Horizons will be the first spacecraft to visit Pluto and the Kuiper Belt. The spacecraft's journey began in January 2006. It will continue into the Kuiper Belt after its Pluto flyby in 2015.
Read More About the Kuiper Belt 
