Color in the Sky

Why is the sky blue? Seen from outside Earth's atmosphere, in outer space, the sky has no color, The deep blackness of space is interrupted only by pinpoints of light from distant stars and an intense source of white light coming from the nearest star, 93 million miles distant- our sun.
Sky color results from an interaction between air molecules and solar radiation in which air molecules momentarily absorb solar energy, then scatter it in all directions.
The energy of blue scattered light is about 16 times greater than that of red scattered light. When we look at the sky, our eye collects light of all wavelenghts. But the eye is overwelmed by the more energetic blue light, and the mind pronounces, "The sky is blue."

Blue light can also overwelm photos if a photographer is not on his game. I shot this photo from a cave in Dinosaur Provincial Park.