These wispy linea are geologically young fractures exposing the icy surface of the moon. Lit terrain seen in this image is on the trailing hemisphere of Dione (1123 kilometers, or 698 miles across). North on Dione is up. The view was acquired from a position 39 degrees south of the moon's equator. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on December 26, 2008. The view was obtained at a distance of approximately 789,000 kilometers (490,000 miles) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 124 degrees. Image scale is 5 kilometers (3 miles) per pixel.
(Source: NASA/Jet Propulsion Laboratory, Cassini Equinox Mission)