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Planetary system
A planetary system is a set of gravitationally bound non-stellar objects in orbit around a star or star system. Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals〔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.〕〔p. 314, ''Collins Dictionary of Astronomy'', Valerie Illingworth, London: Collins, 2000. ISBN 0-00-710297-6.〕 and circumstellar disks. The Sun together with its planetary system, which includes Earth, is known as the Solar System.〔p. 382, ''Collins Dictionary of Astronomy''.〕〔p. 420, ''A Dictionary of Astronomy'', Ian Ridpath, Oxford, New York: Oxford University Press, 2003. ISBN 0-19-860513-7.〕 The term exoplanetary system is sometimes used in reference to other planetary systems.
A total of exoplanets (in planetary systems, including multiple planetary systems) have been identified as of .
Of particular interest to astrobiology is the habitable zone of planetary systems where planets could have surface liquid water.
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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