Labels: Idunn Mons , Magellan , Venus , Venus Express Sunday, April 11, 2010 Dione's Wispy Terrain Wispy terrain winds across the trailing hemisphere of Saturn 's moon Dione in this Cassini view taken during the spacecraft's Jan. 27, 2010 non-targeted flyby. Cassini came within about 45,000 kilometers (28,000 miles) of