A star system, also known as a solar system, planetary system, or simply a system, was a group of celestial bodies, usually planets, orbiting a star. Most stars in the galaxy had their own planetary system. Chains of important star systems formed runs, which were vital navigational routes for trade and transit, and may have crossed multiple sectors. A single system could contain dozens of planets, even more moons, and any number of celestial bodies.
During the crisis that led to the Clone Wars, several hundred systems that belonged to the Galactic Republic seceded and formed the Confederacy of Independent Systems under the leadership of a former Jedi Master, Count Dooku of Serenno.