Rocky Sisters

Two Saturnian moons meet in the sky: Dione departs after crossing the face of Rhea for several minutes.
Dione, at right, has a notably smoother-looking surface than Rhea, thus suggesting the former has been modified more recently.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 14, 2006 at a distance of approx. 2,7 MKM (such as about 1,7 MMs) from Dione and 3,1 MKM (about 1,9 MMs) from Rhea.
The phase angle is about 134° on both moons, while the image scale is about 16 Km (such as roughly 10 miles) per pixel on Dione and about 18 Km (11 miles) per pixel on Rhea.