4000 Kilometers Above Saturns Iapetus . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: What does the surface of Saturn's mysterious moon Iapetus look like? To help find out, the robotic Cassini spacecraft now orbiting Saturn was sent soaring last week just 2,000 kilometers from the unique equatorial ridge of the unusual walnut-shaped two-toned moon . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...