Umbriel may be the darkest of Uranus’ largest moons. It demonstrates only 16 per cent of the light that strikes its surface area, a function just like the highland areas of Earth’s moon. It was identified in 1610 by Galileo, with its observation, and that of another 3 Galilean moons, https://best-moons95937.sharebyblog.com/34541488/5-essential-elements-for-best-moons