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PHOTO CAPTION                                     P-47064
                                                  July 10, 1996
 
A mosaic of four Galileo high-resolution images of the Uruk
Sulcus region of Jupiter's moon Ganymede is shown within the
context of an image of the region taken by Voyager 2 in 1979.
The image shows details of parallel ridges and troughs that are
the principal features in the brighter regions of Ganymede.  The
Galileo frames unveil the fine-scale topography of Ganymede's
ice-rich surface, permitting scientists to develop a detailed
understanding of the processes that have shaped Ganymede.
Resolution of the Galileo images is 74 meters (243 feet) per
pixel, while resolution of the Voyager image is 1.3 kilometers
(0.8 mile) per pixel.  In this view, north is to the top, and the
sun illuminates the surface from the lower left nearly overhead.
The area shown, at latitude 10 degrees north, longitude 168
degrees west, is about 120 by 110 kilometers (75 by 68 miles) in
extent.  The image was taken June 27 at a range of 7,448
kilometers (4,628 miles).  The Jet Propulsion Laboratory manages
the Galileo mission for NASA's Office of Space Science.