. This collage, consisting of two Cassini images of long, sinuous, tendril-like features from Saturn's moon Enceladus (grainy images) and two corresponding computer simulations of the same features (clearer images), illustrates how well the structures, and the sizes of the particles composing them, can be modeled by tracing the trajectories of tiny, icy grains ejected from Enceladus' south polar geysers. NASA/JPL-Caltech/Space Science Institute