What Makes the Sky Change Colors at Night?

The sky changes color at night because of tiny particles in the air. Imagine you're looking at a big, glowing ball (like the sun or moon), and it shines through a special blanket made of little pieces, like a filter. These pieces change how the light looks to our eyes, making the sky appear different colors, from blue to purple and even green.

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Examples

A bright full moon on a cloudy night makes the sky look purple because the clouds catch the light like a blanket.
Sunset colors become more vivid when there's smoke from a fire, making the sky look orange or red.
At night, the sky sometimes glows green if there are high energy particles in the air.

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Categories: Environment · sky colors,atmosphere,light scattering