Comets
A comet is a small icy object orbiting the Sun. Comets have a wide range of different orbits - some are only a few years long while others take hundreds of thousands of years. These orbits are used to divide comets into two categories:
Short-period comets come from the areas beyond Neptune called the Kuiper belt and Scattered disk.
Long-period comets are believed to come from even further out in the Oort Cloud.
As comets come near the Sun they develop a coma and possibly a tail, as volatile materials in the nucleus vaporize and carry away dust. After many orbits comets may eventually lost all their volatiles and become "extinct", resembling an asteroid.
Names: Unahiroa