A cloud is a visible mass of liquid droplets or frozen crystals made of water and/or various chemicals suspended in the atmosphere above the surface of a planetary body.

The color of a cloud, as seen from Earth, tells much about what is going on inside the cloud.

Red, orange, and pink clouds occur almost entirely at sunrise/sunset and are the result of the scattering of sunlight by the atmosphere.  The clouds do not become that color; they are reflecting long and unscattered rays of sunlight, which are predominant at those hours.

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