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Saturn, the ringed planet, second only to Jupiter in size. Named after the Roman god of agriculture. The associated Greek god Chronos was the god of time. Saturn is the slowest moving - and most distant - of the planets known in ancient times. Saturn has a bright and spectacular ring system discovered by Christiaan Huygens in 1659. The rings are composed of innumerable small particles, primarily water ice, ranging in size from a centimetre to several metres across. Extraordinarily thin, the rings are no more than 1.5 km thick. Saturn has 18 known moons, the largest, Titan, being bigger than Mercury and Pluto and, after Jupiter’s Ganymede, the largest in the Solar System. Pan, the smallest, was discovered in 1990.
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