The sky is blue because the sunlight bounces off tiny particles in the air, and blue light travels faster. Imagine the sun sending out a rainbow of colors, red, orange, yellow, green, blue, and violet. When sunlight hits the air, the small bits of air act like little mirrors. Blue light gets scattered more than other colors, so it goes everywhere, making the sky look blue to us.
Examples
- When you look at the sky in the morning or evening, it looks orange or red because the sunlight has to travel through more of Earth's atmosphere.
- You might notice that on a cloudy day, the sky looks white, clouds scatter all wavelengths of light equally.
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Categories: Science · optics,light,atmosphere