Saturn

Saturn, the large gas giant beyond Jupiter and sixth planet from the Sun, is one of the five (Mercury, Venus, Mars and Jupiter) planets visible from Earth using only the naked-eye. Galileo, with his rather primitive refracting telescope, was the first to observe Saturn's complex ring system. Since then Saturn has been seen as a symbol of the majesty, mystery, and order of the physical universe. Although many other planets do indeed have ring systems (Jupiter, Uranus and Neptune) they are not nearly as extensive nor brilliant. While the origin of these great rings is at present unknown, scientists hope to learn more through studying the planet's history with the aid of space probes such as Cassini.