Scientists have finally figured out how two faint outer rings around Uranus formed, solving a mystery nearly 2 billion miles away that had puzzled astronomers for years. A new study examined the planet's two outer rings, known as the μ ring and the ν ring, which orbit far beyond Uranus' main ring system. "This study represents the most comprehensive characterization of the outer Uranian rings to date," the study stated. Until 1977, Saturn was the only planet known to have rings, but after