Caption: 
A new SwRI study describes how unique populations of craters on two of Saturn’s moons could help indicate their age and the conditions of their formation. A unique pattern of elliptical craters along the equators of Saturnian satellites Tethys and Dione indicates slow and shallow impacts on an east/west trajectory and the possibility of planetocentric impactor populations similar to others in the outer solar system.

Credit: 
Courtesy of NASA/JPL/SSI/Lunar and Planetary Institute