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A planetary gear system, also known as an epicyclic gear train, consists of three main components: a central sun gear, multiple planet gears that rotate around the sun gear, and an outer ring gear that meshes with the planet gears. This configuration allows for high torque transmission and compact design, making it ideal for applications in automotive transmissions, industrial machinery, and aerospace. The unique arrangement of the gears provides advantages such as smooth operation, high efficiency, and the ability to handle high power loads.