Definition
A rocky moon is a type of natural satellite whose composition is mainly silicate or metallic. It is distinguished by the absence of a dense atmosphere and by a stable surface dominated by solid rocks and marked reliefs.
Structure
The internal structure generally includes a solid crust made of minerals resting on a partially rigid mantle. Some moons have a dense metallic or rocky core responsible for internal differentiation.
Surface
The surface shows impact craters, fractures, basaltic or mountainous plains. The absence of atmosphere prevents significant erosion, allowing the preservation of ancient structures.
Dynamic functions
The dynamics of a rocky moon result from its gravitational interaction with the main planet and other bodies. This interaction can produce phenomena such as gravitational locking, internal tides, and occasional fractures.
Evolution
The evolution depends on internal heat and impact history. A rocky moon may remain geologically stable for long periods or show ancient traces of tectonic and volcanic activity.
Limitations
The definition of a rocky moon differs from that of icy or volcanic moons by the predominance of solid mineral materials and the near absence of external icy layers or current active processes.