context: As of 2008, 13 rings are known. In order of increasing distance from the planet, they are arranged as follows: 1986U2R / ζ, 6, 5, 4, α, β, η, γ, δ, λ, ε, ν and μ. The minimum radius has the 1986U2R / ζ ring (38,000 km), the maximum has the μ ring (approximately 98,000 km). Between the main rings there may be weak dust ring accumulations and open arcs. The rings are extremely dark, the Bond albedo for the particles included in them does not exceed 2%. They probably consist of water ice with inclusions of organic matter.
question: How many rings does Uranus have?
answers.text: 2008, 13