Prometheus and the Ghostly F Ring Posted on August 7, 2017 by Frank Cisco The thin sliver of Saturn’s moon Prometheus lurks near ghostly structures in Saturn’s narrow F ring in this view from NASA’s Cassini spacecraft. via NASA http://ift.tt/2wAP7cL Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like Loading... Related