A Pileus Iridescent Cloud Over Ethiopia . ... Credit Copyright: Esther Havens ( Light the World ) Explanation: Yes, but how many dark clouds have a multicolored lining? Pictured, behind this darker cloud, is a pileus iridescent cloud , a group of water droplets that have a uniformly similar size and so together diffract different colors of sunlight by different amounts. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... A service of: LHEA at NASA / GSFC . ...