What Causes the Color of a Sunset?

Imagine the sun as a giant ball of light. When it’s low on the horizon, its light has to travel through more air than when it's high in the sky. This makes the light bend and spread out, giving us cool colors like reds, oranges, and purples. It's like when you look at a rainbow, the sunlight is playing tricks with the air! Particles in the air help make these colors pop up.

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Examples

The sky looks red at sunset because the light has to go through more air, and blue gets scattered out.
A dusty day can make sunsets look even more colorful because dust helps scatter the light.
If you're on a mountain top, the colors might be different than if you're in the city, where there's more pollution.

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Categories: Physics · light,optics,atmosphere