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 ...

But that means purple colors get scattered even more than blue. So why doesn’t the sky normally look purple? Very good point. Two reasons: First, when the sun produces light, it’s not equal ...