![Portion of Ganymede’s icy surface showing characteristic dark and light grooved terrain, as …[Credits : NASA/JPL]](http://media-2.web.britannica.com/eb-media/89/75389-004-EF2440B2.jpg)
Portion of Ganymede’s icy surface showing characteristic dark and light grooved terrain, as recorded by the Galileo spacecraft on May 7, 1997. The region in the image is about 660 km (410 miles) in its longer extent. Visible in the bright areas, which are younger, are lanes of parallel and intersecting ridges and valleys dotted with still brighter impact craters.
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