Umbriel is definitely the darkest of Uranus’ major moons. It displays only 16 p.c of The sunshine that strikes its area, a characteristic much like the highland regions of Earth’s moon. Large-impression speculation. In Wikipedia. By NASA/JPL-Caltech, General public Domain, Wikipedia Moons type via a range of procedures, according to https://becketthiheb.blogspothub.com/33785277/the-definitive-guide-to-best-moons