Iapetus features a high-contrast surface of light and dark. As such, it has been dubbed the yin and yang of the Saturn moons. Iapetus, like Rhea, is thought to be composed of ice and rock.

Saturn's first moon, Titan, was discovered in 1655 by Christiaan Huygens, and in the following decades, Jean-Dominique Cassini discovered Iapetus ... With a background in travel and design ...

The arcs near the center are the orbits of Titan and Iapetus, two of Saturn's large outer moons. For scale, the white circle under the scale bar is the orbit of the moon around the Earth.