Why would a cloud appear to be different colors? A relatively rare phenomenon known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors simultaneously. These clouds are formed of small water droplets of nearly uniform size. When the Sun is in the right position and mostly hidden by thick clouds, these thinner clouds significantly diffract sunlight in a nearly coherent manner, with different colors being deflected by different amounts. Therefore, different colors will come to the observer from slightly different directions. Many clouds start with uniform regions that could show iridescence but quickly become too thick, too mixed, or too far from the Sun to exhibit striking colors. The above iridescent cloud was photographed in 2009 from the Himalayan Mountains in Nepal, behind the 6,600-meter peak named Thamserku.
Psychedelic rainbow over Mount Everest This is an event that is extremely rare to be seen among these mountains, yet one photographer, Oleg Bartunov, managed to be in the perfect place and the perfect time. Many others had visited Mount Everest, but none had been as lucky to be here at the same as Bartunov. It is said that this marvel is created from tiny ice crystals that are found within the center of these clouds