View of a portion of the Uruk Sulcus region on Ganymede showing how the fine details of the grooved terrain that are the principal features in the brighter regions of this satellite relate to the global view of the moon. North is to the top of the inset picture and the sun illumination is almost overhead. The global view is a Voyager picture taken in 1979. The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.