This is a re-do of an old piece I did in 2015. Umbriel is a moon of Uranus. Dark, cold, and mysterious, our only images of this enigmatic world come from the fly-by of Voyager 2 in 1986. Wunda crater, located on the equator, stands out against the soot-colored surface, with a ring of bright material covering the basin floor. No one knows what this material is, but exposed ice is a good contender.