Hi, we have look at the sky many time but we might not asking our self is the ral color of the sky blue? Or not? If yes what is make and if not why it looks blue? in fact the real color of sky is not blue but in a quick explanation we can say the way light passing the atmosphere cause the light coming from the sky and passing atmosphere looks blue. For knowing more we need to know more about the light in self. The light contains more different colors. Each of colors of light have different wave length. Red light has the longest wave and the blue light is the shorter one.