Approaching Rhea (3)

Spettacolare la nitidezza di alcuni rilievi posti lungo il Terminatore; da notare una sostanziale mancanza di photographic artifacts i quali invece - di regola - caratterizzano questo tipo di immagini. Lo streak di luce che si vede alla Sx di Rhea (circa ore 10 del frame) potrebbe essere un raggio cosmico.

"...Rhea is the largest airless satellite in the Saturnian System. It is an icy body with a low density, which indicates that it is composed of a rocky core taking up less than 1/3rd of the moon's mass, with the rest composed of water-ice. Rhea is somewhat similar to Dione: they both have similar composition, albedo features, varied terrain and synchronous rotations. Rhea is heavily cratered with bright wispy markings. Its surface can be divided into 2 geologically different areas based on crater density. The 1st area contains craters that are larger than 40 Km in diameter while the 2nd area, spanning over parts of the Polar and Equatorial Regions, has craters under 40 Km in diameter and this suggests that a major resurfacing event occurred some time during its formation.