The sky turns pink at sunset because the sunlight has to travel through more of the Earth's atmosphere. When the sun is low in the sky, its light travels a longer path through the air, and blue light gets scattered away, leaving behind reds and pinks. It’s like when you shine a flashlight through a cup of water, the colors change depending on how far the light goes.
Examples
- On a clear day, the sky is blue because the blue light scatters more than other colors, but at sunset, that blue light gets scattered out of the way.
- Imagine a painter using only red and orange paint, that's what the sun looks like as it sets.
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Categories: Science · optics,light,atmosphere