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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
http://www.jpl.nasa.gov

PHOTO CAPTION P-47067
July 10, 1996

Ancient impact craters shown in this image of Jupiter's moon
Ganymede taken by NASA's Galileo spacecraft testify to the great
age of the terrain, dating back several billion years. At the
margin at the left, half of a 19-kilometer-diameter (12-mile)
crater is visible. The dark and bright lines running from lower
right to upper left and from top to bottom are deep furrows in
the ancient crust of dirty water ice. The origin of the dark
material is unknown, but it may be accumulated dark fragments
from many meteorites that hit Ganymede. In this view, north is
to the top, and the sun illuminates the surface from the lower
left about 58 degrees above the horizon. The area shown is part
of Ganymede's Galileo Regio region at latitude 18 degrees north,
longitude 147 degrees west; it is about 46 by 64 kilometers (29
by 38 miles) in extent. Resolution is about 80 meters (262 feet)
per pixel. The image was taken June 27 at a range of 7.563
kilometers (4,700 miles). The Jet Propulsion Laboratory manages
the Galileo mission for NASA's Office of Space Science.