How many moons does Uranus have? Uranus has 27 moons that we know of. Five of the moons are large and the rest are much smaller. The five large moons are called Miranda, Ariel, Umbriel, Titania, and Oberon. Titania is the largest moon of Uranus and it is covered with small craters, a few large craters, and very rough rocks. Ariel is the brightest moon of Uranus and has canyons and valleys as well as a lot of craters. Umbriel is very dark. Umbriel and Oberon have old heavily cratered surfaces. Miranda has a very unique surface. It has huge canyons as deep as 12 miles, terraced layers and a mix of young and old surfaces.