Internal structureAlthough Saturn is termed a gas giant, it is not entirely gaseous. The primary element that forms Saturn is hydrogen, which forms a non-ideal liquid when the density increases beyond 0.01 g/cm3. This density is reached at a radius containing 99.9% of Saturn's mass. The temperature, pressure and density inside the planet all rise steadily toward the core, which, in the deeper layers of the planet, cause hydrogen to transition into a metal.Though there is no direct information about Saturn's internal structure, planetary models suggest that its interior is similar to that of Jupiter, having a small rocky core surrounded by hydrogenand heliumwith trace amounts of various volatiles.The rocky core is similar in composition to the Earth, but more dense. Examination of the gravitational momentof the planet, in combination with physical models of the interior, allowed French astronomers Didier Saumon and Tristan Guillot to place constraints on the mass of the planet's core. In 2004, they estimated
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internal structure, metallic hydrogen layer, lower density hydrogen