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PHOTO CAPTION                                 Ridges on Europa
                                              January 17, 1997
                                              P-48227

     This is the highest resolution picture ever taken of the 
Jupiter moon, Europa.  The area shown is about 5.9 by 9.9 miles 
(9.6 by 16 kilometers) and the smallest visible feature is about 
the size of a football field.  In this view, the ice-rich surface 
has been broken into a complex pattern by cross-cutting ridges 
and grooves resulting from tectonic processes.  Sinuous rille-
like features and knobby terrain could result from surface 
modifications of unknown origins.  Small craters of possible 
impact origin range in size from less than 330 feet (100 meters) 
to about 1300 feet (400 meters) across are visible.

     This image was taken by the solid state imaging television 
camera aboard the Galileo during its fourth orbit around Jupiter, 
at adistance of 2060 miles (3340 kilometers).  The picture is 
centered at 325 degrees West, 5.83 degrees North.  North is 
toward the top of this image, with the sun shining from the 
right.

     The Jet Propulsion Laboratory, Pasadena, CA manages the 
mission for NASA's Office of Space Science, Washington, DC.

     This image and other images and data received from Galileo 
are posted on the World Wide Web, on the Galileo mission home 
page at URL http://www.jpl.nasa.gov/galileo. Background 
information and educational context for the images can be found 
at URL 

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