Phoebe: Comet Moon of Saturn . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Was Saturn's moon Phoebe once a comet? Images from the robotic Cassini spacecraft taken two years ago when entering the neighborhood of Saturn indicate that Phoebe may have originated in the outer Solar System . ... The image was taken from around 30,000 kilometers out from this 200-kilometer diameter moon . ... NASA Web Site Statements, Warnings, and Disclaimers . ...