Hydrogen in Saturn gets so dense towards the core that it turns into metal.
It's sometime hard to believe that the same elements that exist on our little blue home are also present in the giant, magestic, cosmic beast that is Saturn.
Saturn is classified as a gas giant because the exterior is predominately composed of gas and lacks a definite surface. However, it does have a solid core.
The planet primarily consists of hydrogen. The density of the hydrogen reached at the radius is 99.9% of Saturn's mass. The temperature, pressure, and desnity inside the planet all rise steadily towards the core which, in the deeper layers of the planet, cause hydrogen to morph into a metal.