page_title: Star system
hierarchical_section_title: Star system
caption_attribution_description: English: Orbit of HD 188753, a hierachical triple star system. This artist's concept shows the orbits of a triple-star system called HD 188753, which was discovered to harbor a gas giant, or "hot Jupiter," planet. Français&#160;: Vue d′artiste de HD 188753 montrant les orbites du système stellaire triple, avec hiérarchie.
context_page_description: A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster but, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies.
  A stellar system of two stars is known as a binary star, binary star system or physical double star. If there are no tidal effects, no disturbance from other forces, and no transfer of mass from one star to the other, such a system is stable. Both stars will orbit around the center of mass of the system indefinitely. Examples of binary systems are Sirius, Procyon and Cygnus X-1, the last of which probably consists of a star and a black hole.
context_section_description: A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster but, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies.
  A stellar system of two stars is known as a binary star, binary star system or physical double star. If there are no tidal effects, no disturbance from other forces, and no transfer of mass from one star to the other, such a system is stable. Both stars will orbit around the center of mass of the system indefinitely. Examples of binary systems are Sirius, Procyon and Cygnus X-1, the last of which probably consists of a star and a black hole.
caption: Artist's impression of the orbits of HD 188753, a triple star system
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