A star system is an area of space located around a star, and includes all of the objects that orbit that star, i.e. planets, moons, asteroids, and comets, which are all held in place in the star's gravity well.
The size of a solar system is usually dictated by the extent of a star's gravitational pull on the system. The edge of a system is usually made up of an Oort cloud, which is a layer of ice and debris. (ST reference book: Star Trek: Star Charts).
|Multiverse • Universe • Galaxy|
|Galactic Regions:||Quadrant • Sector • Cluster • Nebula • Star system|
|System Bodies:||Star • Planet • Planetoid • Dwarf planet • Asteroid • Meteoroid • Comet|
The galactic standard approach to naming star systems was to base the name off the central star or planet.
There are seven billion one hundred million stars in the known galaxy, with approximately three billion two hundred million habitable star systems. Only about a billion of these systems have life. Only sixty-nine million of those systems meet population requirements for Imperial representation. All star systems are given coordinates that are used by navicomputers to permit space travel.
Star Wars Episode V: The Empire Strikes Back