A blue sky is a good sky. It's a reassuring sight that promises clear weather and bright days. But what does it mean when the sky turns purple? While it's not uncommon to spot purple skies during ...

The sky is blue — physicists tell us — because blue light in the sun's rays bends more than red light. But this extra bending, or scattering, applies just as much to violet light, so it is ...

Before answering why the sky is purple, here's a quick rundown as to why the sky is blue. The sun emits shortwave radiation on the visible light spectrum, and in a process called Rayleigh ...

Why is the sky blue? It's a common question asked by children, and the simple answer is that blue light is scattered by our atmosphere more than red light, hence the blue sky. That's basically tru ...