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A '''planetary system''' is a set of [[gravity|gravitationally]] bound non-[[Star|stellar]] objects in or out of [[orbit]] around a [[star]] or [[star system]]. Generally speaking, systems with one or more [[planet]]s constitute a planetary system, although such systems may also consist of bodies such as [[dwarf planet]]s, [[asteroid]]s, [[natural satellite]]s, [[meteoroid]]s, [[comet]]s, [[planetesimal]]s<ref>p. 394, ''The Universal Book of Astronomy, from the Andromeda Galaxy to the Zone of Avoidance'', David J. Dsrling, Hoboken, New Jersey: Wiley, 2004. {{ISBN|0-471-26569-1}}.</ref><ref>p. 314, ''Collins Dictionary of Astronomy'', Valerie Illingworth, London: Collins, 2000. {{ISBN|0-00-710297-6}}.</ref> and [[circumstellar disk]]s. The [[Sun]] together with the planetary system revolving around it, including [[Earth]], forms the [[Solar System]].<ref>p. 382, ''Collins Dictionary of Astronomy''.</ref><ref>p. 420, ''A Dictionary of Astronomy'', Ian Ridpath, Oxford, New York: Oxford University Press, 2003. {{ISBN|0-19-860513-7}}.</ref> The term '''exoplanetary system''' is sometimes used in reference to other planetary systems.
{{Extrasolar planet counts|full}} [[Debris disk|Debris disks]] are also known to be common, though other objects are more difficult to observe.
Of particular interest to [[astrobiology]] is the [[habitable zone]] of planetary systems where planets could have surface liquid water, and thus the capacity to support Earth-like life.
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