Ganymede’s dark ancient crust sits beside bright grooved ice
Ganymede’s surface splits into dark, heavily cratered terrain and brighter regions laced with grooves — a patchwork that records both ancient crust and later tectonic stretching of ice.
The dark patches may be older dirty ice; the bright lanes look younger and deformed. That contrast maps interior heat and stress without needing to invoke any single subsurface layer story.
Terrain pairs tell moon history. Ganymede wears two faces of ice geology that make it a planetary companion with continents of time written in frost.
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