Crescent Japetus (Natural Colors; credits: Lunar Explorer Italia)

Caption NASA:"Only a slice of Japetus is illuminated in this image, but still the Cassini Spacecraft spies the distinctive two-tone surface of this distant Saturnian moon.
Lit terrain seen here is on the Leading Hemisphere of Japetus (about 1471 Km, or about 914 miles across). North on Japetus is up and rotated 13° to the left.

The view was acquired at a distance of approx. 2,7 MKM (about 1,7 MMs) from Japetus and at a Sun-Iapetus-Spacecraft, or Phase, angle of 111°. The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on March 3, 2009.
Image scale is roughly 16 Km (about 10 miles) per pixel".