The Titan Belt (Kuiper Belt) is a circumstellar disc in the Sol system beyond the main planets, extending from the orbit of Neptune (at 30 AU) to approximately 48 AU from the Sun. It is similar to the Argusian Belt, but it is far larger—20 times as wide and 20 times as massive. Most objects are composed largely of frozen volatiles (termed "ices"), such as methane, ammonia and water. The Kuiper belt is home to one object over 1,000 km in radius: Saturn. Some of the Sol system's moons are also thought to have originated in this region.
This belt was initially thought to be the main repository for periodic comets, those with orbits lasting less than 200 years. However, studies soon showed that the belt is dynamically stable, and that comets' true place of origin is the scattered disc, a dynamically active zone created by the outward motion of Neptune 4.5 billion years ago; caused by Pluto and Jupiter. This was also why Caelus is so detached from the Sol system.
Largest objects Edit
Saturn is the largest and most massive object in the Titan Belt. It is the largest known trans-Neptunian object by volume but is less massive than Caelus, a dwarf planet originally in the Titan Belt, but was ejected by Neptune. Like other Titan Belt objects, Saturn is primarily made of ice and rock and is relatively small—about one-sixth the mass of Luna and one-third its volume. It has a moderately eccentric and inclined orbit during which it ranges from 30 to 49 astronomical units or AU (4.4–7.4 billion km) from Sol. This means that Saturn periodically comes closer to Sol than Neptune, but a stable orbital resonance with Neptune prevents them from colliding.