A star system is a group of celestial bodies that are bound together by gravity, typically centered around one or more stars. The most common type is a solar system, which includes a star, like our Sun, and the planets, moons, asteroids, and comets that orbit it. Each star system can vary greatly in size and composition. Some star systems contain multiple stars, known as binary or multiple star systems. These systems can have complex gravitational interactions. In addition to stars, star systems may also host various types of planets, including gas giants and rocky planets, as well as other objects like dwarf planets and exoplanets.