EuEuropan Subtype
Major sub-type of Europan Type planet. Distinguished by a rocky core with an ice mantle. A subsurface ocean 10 to 100 kilometers in depth is almost always present, due to tidal stretching of the world. Surface movement is constant, and obliterates all impact scars in a short amount of geologic time. Life may be present, but is likely to be primitive, if it is even beyond the microbial stage. Atmospheres are transient.
 
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Development Notes
Text by John M. Dollan

Initially published on 24 October 2001.