Cosmic "Smile"...

Caption NASA:"Only a sliver of Dione is visible as the Cassini Spacecraft looks at the dark side of the moon. In a high-phase viewing geometry like the one in which this picture was taken, the Sun and the Spacecraft are on nearly opposite sides of the moon. Here, only a narrow crescent reflects light forward toward Cassini's camera. The outline of a crater is just visible in the Southern Hemisphere.

This view looks toward the Leading Hemisphere of Dione. North on Dione is up and rotated 2° to the right. The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Feb. 25, 2009.
The view was acquired at a distance of approx. 484.000 Km (such as about 301.000 miles) from Dione and at a Sun-Dione-Spacecraft, or Phase, Angle of 166°.
Image scale is roughly 3 Km (a little less than 2 miles) per pixel".