Many impact craters -- the record of the collision of cosmic debris -- are shown in this mosaic from NASA's Voyager 1 of Saturn's moon Dione.

Many impact craters -- the record of the collision of cosmic debris -- are shown in this Voyager 1 mosaic of Saturn's moon Dione. The largest crater is less than 100 kilometers (62 miles) in diameter and shows a well-developed central peak. Bright rays represent material ejected from other impact craters. Sinuous valleys probably formed by faults break the moon's icy crust. Images in this mosaic were taken from a range of 162,000 kilometers (100,600 miles) on Nov. 12, 1980. The Voyager Project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif.

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