A planetary system is a set of gravitationally bound non-stellar objects in orbit around a star or star system. Generally speaking, planetary systems describe systems with one or more planets, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets and planetesimals as well as disce...
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http://en.wikipedia.org/wiki/Planetary_system
(from the article `Cosmos`) Although it is commonly believed that planetary systems are plentiful in the universe, the only example known with certainty is the solar system. The ... The astronomical detection of planetary systems around other stars would help enormously to loosen the restrictions imposed by being able to study ... .....
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http://www.britannica.com/eb/a-z/p/76
A collection of planets and smaller objects, such as moons, asteroids, and comets, orbiting around a star. Planetary systems are believed to originate from rotating clouds of dust and gas that encircle stars shortly after their birth (see planetary systems, formation). Evidence is gathering that the...
Found on
http://www.daviddarling.info/encyclopedia/P/plansys.html
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