Why is the sky blue?

Answer 1

The blue color of the sky is due to Rayleigh scattering.
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Answer 2

The sky is blue because of the scattered light in the atmosphere. White light has several wavelengths from red to violet and the scattering is inversely related to the wavelength. Blue being shorter than red, is scattered more by the air and hence the sky is blue during the day.

If the atmosphere was something other than the nitrogen + oxygen mixture which we call air (like say carbon dioxide or something else), the color would have been different. In moon and similar smaller celestial bodies with no atmosphere, the sky is space and is black with all the stars perfectly visible through out the day and night.

At sunrise and sunset times, when the sun light has to travel a longer path through the earth's atmosphere, the sky appears orange colored because the blue color gets attentuated due to scattering and the longer wavelength light of orange color comes through.

Thus while the sky is generally blue, it need not be always so.

Answer 3

Scattering occurs when the atoms of a transparent material are not smoothly distributed over distances greater than the length of a light wave, but are bunched up into lumps of molecules or particles. The sky is bright because molecules and particles in the air scatter sunlight. Light with higher frequencies and shorter wavelengths is scattered more than light with lower frequencies and longer wavelengths. The atmosphere scatters violet light the most, but human eyes do not see this color, or frequency, well. The eye responds well to blue, though, which is the next most scattered color. Sunsets look red because when the Sun is at the horizon, sunlight has to travel through a longer distance of atmosphere to reach the eye. The thick layer of air, dust and haze scatters away much of the blue. The spectrum of light scattered from small impurities within materials carries important information about the impurities. Scientists measure light scattered by the atmospheres of other planets in the solar system to learn about the chemical composition of the atmospheres.

Answer 4

When light falls onto the ground through the air, the white light is filtered through our atmosphere which is mainly consistent of Nitrogen. This causes the blue light to be mainly reflected and the rest of the colours absorbed. So when the blue light falls on our eyes, we feel that the sky is blue.

In outer space, there is no nitrogen filled atmosphere so there is no blue sky.

Answer 5

The sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer 6

The light coming from sun is white in color. when it passes through the atmosphere to reach the earth surface it get scattered by the molecules present in the upper layer of atmosphere.
This scattering of light waves by moloecules present in the atmosphere is called rayleigh scattering. According to Rayleigh the amount of scattering is inversly proportional to the fourth power of the wavelength. Hence in the solar spectrum, blue color is having less wavelength. Hence it scatters more than other colors and the sky appears blue.

Answer 7

Light coming from the sun is what's called "white light" White light contains all the colors of the rainbow. When it enters Earth's atmosphere this light is separated into its individual colors by chemical elements in the atmosphere and scattered across the sky. Nitrogen is the most abundant element in our atmosphere, and that element scatters the color blue across our sky more than the other colors. In space, there is no atmosphere to separate colors from the white light and space looks black.

Answer 8

light has three main colors...

blue, green and red...

air molecules, which is a mixture of oxygen, nitrogen, carbon, and hydrogen among other things... has a resonance equal to that of blue light...

That doesnt necessarily mean that it cancels out green and red (yellow)
It just means that it holds onto blue light a split second more than it does the rest...

Answer 9

> Why is the sky blue?

It isn't, it just looks blue.

Answer 10

because you choose blue