Unlike the rings of Saturn, which are very bright and composed of water ice, the rings of Uranus are relatively dark. Instead of containing dust, the rings seem to be made up of larger chunks, measuring 0.2 to 20 m across. There are the narrow main rings, the dusty rings, and the newly discovered outer ring system. The closest ring is 38,000 km away from the center of Uranus and the furthest ring is 98,000 km away. The ring’s geometric thickness is estimated to be 150 meters. The ring system contains little dust overall; it consists mostly of large bodies 0.2–20 m in diameter. The ε ring is the densest and brightest in the Uranus ring system. Uranus’ rings consist of 3 major groups. I am doing a report and I really need the info. Nu is reddish and dusty. ε ring. They made a series of critical new observations about Uranus rings, which were published in The Astronomical Journal. read more. The majority of the particles are bright, which means they haven't had time to collect dust. Uranus has two sets of rings: Inner set, and outer set. While the rings themselves are thought to be as old as the solar system, the particles that make up the rings are very young. There are the narrow main rings, outermost rings, and the dusty rings. δ ring. Older particles have been covered by interplanetary dust, leaving them less reflective. The rings of Uranus were discovered on March 10, 1977, by James L. Elliot, Edward W. Dunham, and Jessica Mink. William Herschel described a possible ring around Uranus in 1789. Most rings are made of rocks 0.2–20 meters wide. It has a maximum or minimum brightness ratio of 2.5 to 3.0. read more. 0 0. The majority of Uranus's rings are opaque and only a few kilometers wide. This suggests the ring particles get recycled somehow. However, some rings are optically thin: the broad and faint 1986U2R/ζ, μ and ν rings are made of small dust particles, while the narrow and faint λ ring also contains larger bodies. The outer set composes of 2 rings: Nu and Mu. Can someone please help me on this. Uranus rings fall into three groups based on size, location, and composition. But some rings are made of very small dust particles. The inner set composes of 9 rings: Zeta, 6, 5, 4, Alpha, Beta, Eta, Gamma, Delta.They are narrow and dark gray colored. This sighting is generally considered doubtful, as the rings are quite faint, and in the two following centuries none were noted by other observers. The narrow main rings. Scientists think that the rings are at not more than 600 million years old. Source: en.wikipedia.org. Thank you.