OFFICE OF PUBLIC INFORMATION JET PROPULSION LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY NATIONAL AERONAUTICS AND SPACE ADMINISTRATION PASADENA, CALIFORNIA 91109. TELEPHONE (2l3) 354-5011 PHOTO CAPTION Voyager 1-81 P-21209C March 5, 1979 This view of Io was taken on March 4 at 7:00 PM from a range of 862,200 kilometers (500,000 miles) by Voyager 1. It shows subspacecraft longitude of approximately 146 degrees. Circular features are seen that may be meteorite impact craters or features of internal origin. Irregular depressions are seen that indicate surface modification has taken place. The bright irregular patches appear to be younger deposits masking the surface detail. JPL manages and controls the Voyager project for NASA's Office of Space Science. #####