Cassini • Darkness Falls on Saturns Ice Moon Rhea 9.5.2021: • The Cassini spacecraft's narrow angle camera captured Saturn's moon Rhea as it gradually slipped into the planet's shadow - an event known as "ingress" - on August 19, 2008. Seventeen consecutive clear-filter images are in this movie showing an eclipse ingress across the Saturn-facing hemisphere of Rhea. Because sunlight still penetrates the planet's upper atmosphere and the sun has a finite size, the shadow of Saturn cast onto Rhea d