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When the Sun's light reaches the Earth's atmosphere it is scattered, or deflected, by the tiny molecules of gas (mostly nitrogen and oxygen) in the air. Because these molecules are much smaller than the wavelength of visible light, the amount of scattering depends on the wavelength. This effect is called Rayleigh scattering, named after Lord Rayleigh who first discovered it.

Shorter wavelengths (violet and blue) are scattered the most strongly, so more of the blue light is scattered towards our eyes than the other colours. You might wonder why the sky doesn't actually look purple since the violet light is scattered even more strongly than blue. This is because there isn't as much violet in sunlight to start with, and our eyes are much more sensitive to blue.

The blue light that gives the sky its colour, is sufficiently bright to make all the stars that we see at night disappear since the light they emit is much dimmer

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Candace Okuneva

Lvl 10
3y ago

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Blue sky means that the sky is blue .Sky is the appearance of the upper atmosphere. Blue is the color of the sky which is the color of the sign in box.

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Wiki User

15y ago
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Is called a bright clear blue.

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Wiki User

10y ago
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m

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Anonymous

4y ago
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Q: What does sky blue mean?
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