The Kuiper belt

The Kuiper belt

. A repository of frozen, comet-sized worlds resides in the outer precincts of the planetary system, just beyond the orbit of Neptune and near the orbital plane of the planets. Known as the Kuiper belt, it is thought to contain 100 million to 10 billion, or 108 to 1010, comets. Many short-period comets are tossed into the inner solar system from the Kuiper belt.

Copyright 2010, Professor Kenneth R. Lang, Tufts University