Darkness sweeps over Iapetus as the Cassini spacecraft watches the shadow of Saturn B ring engulf the dichotomous moon. The image at left shows the unshaded moon, while at right, Iapetus sits in the shadow of the densest of Saturn rings
Darkness sweeps over Iapetus as the Cassini spacecraft watches the shadow of Saturn B ring engulf the dichotomous moon. The image at left shows the unshaded moon, while at right, Iapetus sits in the shadow of the densest of Saturn rings