Saturn's rings. Ultraviolet Cassini spacecraft image of a section of Saturn's rings. The image mainly shows the A ring (turquoise), which is the largest of Saturn's outer rings. The turquoise colour indicates that the A ring is mostly made of ice, whereas the inner C and B rings (red, left) contain dirtier particles. The A ring is separated from the B ring by the Cassini Division (pale red band). Towards the outer edge of the A ring (right) is the Encke Gap (narrow red band). This image was taken by the Ultraviolet Imaging Spectrograph instrument on the Cassini spacecraft after its entry into Saturn orbit on 30 June 2004.