Umbriel is definitely the darkest of Uranus’ major moons. It displays only 16 percent of the light that strikes its surface area, a aspect much like the highland regions of Earth’s moon. Big-affect speculation. In Wikipedia. By NASA/JPL-Caltech, General public Domain, Wikipedia Moons form by way of a number of https://bestmoons93680.blogsmine.com/35205448/a-review-of-bestmoons