The color of the leaves isn't the only thing that changes in autumn. Have you ever looked up on a crisp fall day and noticed how brilliant and clear the blue sky is? That's not just your imagination — ...

THE blue color of the sky on a clear day is familiar to all. And yet how many have considered the source of this delicate mantle of azure which Nature spreads over the dome of the heavens? The ...

The sky appears blue due to sunlight scattering in Earth's atmosphere. While sunlight contains all colors, blue light disperses most effectively, illuminating the sky. Although violet scatters more, ...