Rings of Uranus one of which, Mab, shares its orbit with the outermost newly discovered μ ring. As currently understood, the ring system of Uranus comprises thirteen distinct rings. In order of increasing distance from the planet they are: 1986U2R/ζ, 6, 5, 4, α, β, η, γ, δ, λ, ε, ν, μ rings. They can be divided into three groups: nine narrow main rings (6, 5, 4, α, β, η, γ, δ, ε), two dusty rings (1986U2R/ζ, λ) and two outer rings (ν, μ). The rings of Uranus consist mainly of macroscopic particles and little dust, although dust is known to be present
Wonders of the Solar System Cox concludes by stating that Europa represents the "most fascinating and important alien world we know. A true wonder of the Solar system because it's our best hope of finding extraterrestrial life." An accompanying hardcover book was released on 30 September 2010: The region 1 DVD and Blu-ray discs were released on 7 September 2010. The region 2 DVD and Blu-ray discs of the series were released on 12 April 2010. The region 4 DVD and Blu-ray discs were released on 7 April 2011. Brian Cox from his Twitter account stated that there would be a second series, "Wonders of