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A multiple star system consists of two or more stars that appear from Earth to be close to one another in the sky. [dubious – discuss] This may result from the stars actually being physically close and gravitationally bound to each other, in which case it is a physical multiple star, or this closeness may be merely apparent, in which case it is an optical multiple star [a] Physical multiple ...
This category is for physical multiple stars, i.e., small groups of three or more close stars gravitationally bound to each other. Optical companions (stars that appear to be close together but are physically unrelated) do not count. Star systems placed here should be categorized by their number of components.
The stars with the most confirmed planets are the Sun (the Solar System's star) and Kepler-90, with 8 confirmed planets each, followed by TRAPPIST-1 with 7 planets. The 1007 multiplanetary systems are listed below according to the star's distance from Earth. Proxima Centauri, the closest star to the Solar System, has three planets (b, c and d).
This category is for multiple star systems with confirmed planetary systems, categorized by number of stars. Subcategories This category has the following 4 subcategories, out of 4 total.
This category contains articles about star systems, which are groups of two or more gravitationally-bound stars in a region usually smaller than one light-year. Star clusters (groups of many more stars that occupy a much larger region) are listed in Category:Star clusters.
Triple stars should be placed under the subcategory Triple stars. If a group of four or more stars are physically close and gravitationally bound, it is a physical multiple star and should be placed under the subcategory Multiple star systems. Multiple stars should be categorized by their number of components.
Least stars in a star system There are many single star systems. Most stars in a star system: QZ Carinae. Nonuple star system [78] System contains at least nine stars. [78] [NB 11] [78] Stars in the closest orbit around one another There are many stars that are in contact binary systems (where two or more stars are in physical contact with each ...
It is estimated that approximately one third of the star systems in the Milky Way are binary or multiple, with the remaining two thirds being single stars. [61] The overall multiplicity frequency of ordinary stars is a monotonically increasing function of stellar mass .