Why are there different colors of clouds?.

<P Align=center> </ P> World Scientific reports [tech.] News: the sky clouds of different colors, some white Ruxu, some piece of black, some gray one, and some red and purple .glory. .This is what is different colors how clouds formed? .<P Align=left> cloud thickness to determine the color </ P> <P align=left> we see all kinds of cloud thickness varied widely, up to seventy-eight km thick, thin, only tens of meters. .Stratiform clouds have covered the sky, the product of isolated cloud, and the wave cloud, and many other species. .</ P> <P align=left> very thick layer of cloud or thunder cloud, the sun and the moon's light is difficult to transmission over, looked very black clouds; slightly thinner layer of cloud and wave clouds ., appears to be gray, especially in wave clouds, clouds edges, color is more gray; thin clouds, light easily through, especially from the thin cloud composed of ice crystals, Winston is particularly bright in the sun with .a filamentous shiny, the sky even if such a stratiform cloud, the ground objects in the sun and moon will light reflected shadow. .</ P> <P align=left> sometimes almost can not see the clouds thin out, but as long as found in the sun and the moon around one or several large rings, still we can conclude that there are clouds, this cloud is called the "veil of cirrostratus .. " .The product of isolated cloud, due to relatively thick clouds, sunny side, almost all of the reflected light, which appears to be white; and backlight, and its bottom side, light transmission is not easy to come, looks dark gray. .</ P> <P align=left> too much sun angle determines the color of the cloud </ P> <P align=left> sunrise and sunset, the sun dipped over the light is through the thick atmosphere ., the air molecules, water vapor and impurities, making the light part of a large number of short-wave scattering, while the red, orange, long-wave part of, but not by much scattered, and thus lower exposure to the atmosphere, the long wavelength red light in particular, occupied an absolute majority, .At this time not only sunrise and sunset the sky is red direction, and even the clouds were lit at the bottom and it has become the red edge. .</ P> <P align=left> some as the composition of the cloud droplets, some ice, some two mixed together, so ASE line passed, will result in a variety of beautiful rings or iris. .</ P> </ p>.