Saturn's inside is similar to Jupiter's inside. It has a small rocky core about the size of the Earth at its center. It is very hot. Its temperature reaches 15,000 K (). Saturn is so hot that it gives out more heat energy into space than it gets from the Sun. Above it is a thicker layer of metallic hydrogen, about deep. Above that layer is a region of liquid hydrogen and helium. The core is heavy, with about 9 to 22 times more mass than the Earth's core.
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