Physical characteristics

Classification

Life of the comet

Coma and nucleus

Temperature

Structure and composition of the nucleus

The comet's tail

"Anti-tails"

Tails and plasma

The Kuiper Belt and the Oort Cloud

The Kuiper Belt is a belt of objects starting just beyond the orbit of Neptune (with some objects' orbits overlapping that of Neptune). In addition to being the home of some dwarf planets and many smaller objects, it is the source of the short-period comets. The Oort Cloud is a group of objects located much farther from the Sun than the Kuiper Belt; it is the source of the long-period comets.

Origin and duration of the comets

The Return Of The Comets

Giotto