This image looking at the horizon of Saturn’s moon Rhea was taken by the Cassini spacecraft at a range of about 56,000 km from the small (~1500 km) moon. The surface of Rhea has been mostly shaped by impact cratering. On more geologically active worlds like Earth or moons such as Titan, craters are erased by erosion, volcanoes, or tectonics. On quieter worlds like Rhea, craters remain until they are disrupted or covered up by the ejecta of subsequent impacts.
Image Credit: NASA