This is a cutaway of the interior of Ganymede.
Click on image for full size
Image from: The New Solar System
Evolution of the Interior of Icy Moons
No one really knows how a moon changes as it gets older. The moon may change it's size, and/or have water oceans inside as it changes.
The graph to the left predicts what kind of ice occurs inside the moons. The blue line on the figure shows what the temperature is going to do over time. As the temperature falls, ices will change.
The movie shows how the satellite might change as it cools. Some layers within the satellite may entirely disappear, and the satellite itself may change in size because some kinds of ice take less space than others!
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