Cassini Images Saturns A Ring . ... Credit Copyright: UVIS , U. Colorado , ESA , NASA Explanation: What are Saturn's rings made of? In an effort to find out, the robot spacecraft Cassini that entered orbit around Saturn two weeks ago took several detailed images of the area surrounding Saturn's large A ring in ultraviolet light. ... Conversely, the redder an area appears , the richer it is in some sort of dirt. This and other images show that inner rings have more dirt than outer rings. ...