This is a drawing of the interior of Europa.
Click on image for full size
Interior of Europa
The diagram shows possibilities for the interior structure of Europa. There is a core of rocky material buried inside, overlain with ice of various phases.
The diagram shows that there may be an ocean of water beneath the surface crust of ice on Europa. This is because the temperature inside Europa may be just right for water.
The lack of craters on the surface of Europa provides evidence that activity which resurfaced Europa persisted for far longer than activity which changed the surface of Ganymede. Fresh ice, as well as evidence of flowing liquid cover the surface of Europa.
If the temperature inside Europa is just right, then there might still be water inside. Such an environment might prove to be habitable for life.
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