Saturn's Rings

This ultraviolet image released July 7, 2004, from the Cassini spacecraft in orbit
around Saturn shows, from the inside out, the 'Cassini division' in faint red at left
is followed by the A ring in its entirety. The A ring begins with a 'dirty' interior
of red followed by a general pattern of more turquoise as it spreads away from the planet,
which indicates denser material made up of ice. The red band roughly three-fourths of the
way outward in the A ring is known as the Encke gap. Such information hints at the origin
and evolution of the rings, according to scientists at the University of Colorado at Boulder
who are involved in the mission managed by NASA (news - web sites)'s Jet Propulsion Laboratory
in Pasadena, Calif. This image was made by a $12.5 million instrument called the Ultraviolet
Imaging Spectrograph, known as UVIS for short, that was built at Boulder, Colorado