Sunset

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  The color of sunrise and sunset is caused by the fact that sunlight has to travel a greater distance through the atmosphere when it is near sunrise/sunset at a particular location on Earth.

The color of sunrise and sunset is caused by sunlight having to travel a greater distance through the atmosphere when it is near sunrise/sunset at a certain location on Earth. This causes a greater portion of the blue light to be scattered, leaving more red light. This effect is most visible at sunset, when there is often more dust in the atmosphere.