Beautiful Science - Why does the sky change color at sunset?

The sky changes color at sunset because light from the sun travels a longer path through Earth’s air, and different colors behave differently along the way.

Imagine you're playing with colored blocks, red, blue, green. When the sun is high in the sky, its light goes straight down like a short slide. But when it's near the horizon at sunset, its light takes a long, winding path through the air, like sliding down a tall, twisty slide.

Blue light is like a quick runner, it gets scattered around by tiny particles in the air and doesn’t make it all the way to you. But red light is like a slow, steady runner, it keeps going and goes straight into your eyes, making the sky look red or orange.

Sometimes, when there are more clouds or dust in the air, it's like adding extra players to the game, they catch some of the blue and let more red through. That’s why you might see pink, purple, or even gold skies at sunset!

At sunset, the sky looks like someone painted it with warm colors. It's not magic, just light, air, and how they play together all day long!