Japetus

Caption NASA:"Some of Japetus' Dark Surface interrupts the moon's lighter Terrain in this Cassini view.
Scientists continue to investigate the nature of this moon's dark and light Surface. Lit Terrain seen here is on the Trailing Hemisphere of Japetus. North on Japetus is up and rotated 10° to the right.

The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on May 9, 2010. The view was acquired at a distance of approx. 1,3 MKM (about 808.000 miles) from Iapetus and at a Phase Angle of 95°.
Image scale is roughly 8 Km (about 5 miles) per pixel".