Snowball Fight in Saturn's RingsCredit: NASA/JPLFrom the inside out, the "Cassini division" in faint red at left is followed by the A ring in its entirety in this ultraviolet-light image. The A ring begins with a "dirty" interior of red followed by more blue as it spreads away from the planet. The blue is a signature of water ice. The red band roughly three-fourths of the way outward in the A ring is known as the Encke gap.
This false-color composite image, constructed from data obtained by NASA's Cassini spacecraft, shows Saturn's rings and southern hemisphere. The image was made from 65 individual observations by Cassini's visual and infrared mapping spectrometer on Nov. 1, 2008.