Voyager 2 260-70 July 9, 1979 260-637
Surface features as small as 1 km are visible in this mosaic of Voyager 2 images. The grooves seen in the images are basically long, parallel mountain ridges, 10 to 15 km from crest to crest - about the same scale as the Appalachian mountains in the Eastern United States. The numerous impact craters superposed on the mountain ridges indicates that they are old - probably formed several billion years ago.
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