Saturn

Saturn. Sagan Planet Walk. , A magnificent ring system , . Saturn is a gas giant composed mostly of hydrogen and helium. It has the lowest density of any planet in our Solar System, with about two-thirds being water., . Saturn's rings are made of countless individually orbiting particles that are primarily water ice; most are smaller than a house., . Saturn's inner rings may be the flattest structures in our Solar System. Their diameter is about 30 million times longer than their two-story height., Several moons of Saturn are visible, along with Venus, Earth and its moon, and Mars., Mysterious moons with strange oceans and seas , . Saturn's largest moon, Titan, is the only known extraterrestrial world to host rain, rivers, stable lakes and seas, where methane plays the role of water on Earth., . Saturn's moon, Enceladus, has a liquid water ocean beneath its frozen water shell., [Sidebar:] , The mass of 95 Earths = the mass of 1 Saturn, One Saturn day = 10 hours, 39 minutes, 1 Saturn year = 29.4 Earth years, Known moons: 53, The diameter of Saturn = 9.4 Earth diameters, Earth Highest [temp] 57°c . Lowest [temp] -89°c , Saturn Mean [temp] -178°c, Weight on Earth 100 [lbs] , Weight on Saturn 106 [lbs], In the Sun-sized window are scaled representations of Saturn and its largest moon, Titan., This sculpture and walking tour depict our Solar System at on five-billionth (1/5,000,000,000) of its actual size., [Captions:] , Enhanced photograph of Saturn and its magnificent rings, taken by the Cassini spacecraft when the Sun was behind Saturn., Above: Bright plumes of water ice and water vapor are erupting from the volcanically-active south pole of Enceladus, a small moon of Saturn., Left: False-color photograph of Ligeia Mare, a sea of liquid methane on Saturn's largest moon, Titan, with Cayuga Lake shown for scale.