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Why is the sky blue?

7 Answers
Usually anyway...
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The sky is blue because as the sunlight, which is made up of all the different colors of light, enters our atmosphere, the light photons hit particles. When these photons hit a particle three things can happen, 1. they can pass through it.(transmission) 2. they can be absorbed by it.(absorption) or 3. they can bounce off it (refraction). The different colors of light have different wavelengths and each react differently as they move through the amosphere. Blue light is refracted the most, spreading it all through the atmosphere. This means we see the blue light coming toward us from all directions and so the sky looks blue. When the sun in lower in the sky, at morning and evening, the light has to travel through a thicker more dust filled section of the atmosphere. This scatters or refracts more red light so at these times the sky seems reddish or pinkish.

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C

Wasn't this one of those questions they ask in practice interviews? Along with why does a donut have a hole in the middle.

The sky is blue (usually anyway), because, first and foremost, we have a dense layer of atmosphere above us. Aside from keeping all living things alive, it scatters the light that enters it. There are many different colors of light, and all of them have different wavelengths.

On a clear day, the layer above the earth is seen as blue because the atmosphere scatters blue light more than any other color. The Tyndall effect shows that light with shorter wavelengths become scattered more when passing through a suspension. Blue colored light has shorter wavelengths than red or OYG.

However, going by that analogy, the sky should be violet (shortest wavelength). But it isn't, because some wavelengths are absorbed in the atmosphere instead of being scattered.

The distance the light has traveled also will affect the color we see. That's why sunsets are redder at the horizon. Because the distance is larger, blue light has been diffused and the red, yellow or orange lights are the ones that reach our eyes.

Also, the construction of our eyes has something to do with the color of the skies we see.

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H

Light is part of the spectrum that our eyes see. Sunlight was with a light bulb looks white.In reality it's a combination of many colors, which many say is the addition of all colors. The ozone layer, a natural protective layer mostly of nitrogen and oxygen, surrounding the earth acts as a prism to deflect certain colored harmful rays from the sun. These harmful rays can either burn skin when exposure is over a long period. The rays one's that do make it appear as colors ranging from blue to a bluish gray.

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W

The sky is really not blue - in pictures taken from space it appears black!

The sky appears to be blue to us because of the earth's atmosphere, which interferes with the sunlight coming to us and scatters the blue parts of the visible spectrum all around the earth while allowing the red, yellow and other parts of the spectrum to pass through. This scattered blue light around the earth makes the sky look blue.

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K

The Blue sky is caused by Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. However, much of the shorter wavelength light is absorbed by gas molecules.The absorbed blue light is then radiated and scattered in different directions throughout the sky making the sky appear blue.

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S

It happens by The Reflection of Sunlight. Generally we know the sunlight's have 7 colors. The earth is rounded by the ozone layer and when sunlight want to pass the ozone layer, the blue color reflects more than other colors. When we see the sky there is blue and blue.

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Because blue is the only colour that god's have after created universe..

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