Video narration
If sunlight looks white, why does the sky look blue? The answer begins with what sunlight is carrying. White sunlight is actually a blend of many colours-the familiar rainbow colours travelling together. As this light enters Earth's atmosphere, it passes through countless tiny air molecules. Here's the important turn: these molecules scatter the colours unevenly. Blue light is scattered much more strongly than the other visible colours, so it gets sent off in many directions across the sky. That scattered blue light reaches your eyes from all around you-not because the sky is made of blue, but because sunlight is being spread through the air. That is why the sky seems coloured, even though sunlight itself looks white. So why is the sky blue? Because Earth's atmosphere scatters blue light more strongly than the other colours, sending it into your eyes from every direction.