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why is sky blue?

13 Answers

  • 1 decade ago
    Favorite Answer

    Why is the sky blue? As visible light from the sun passes through the atmosphere, particles of dust and droplets of moisture either absorb or scatter the light. The wavelength of light scattered most by the atmosphere is blue and so the sky appears that color.

    But if the light from the sun usually makes the sky appear blue, what happens at sunrise and sunset to make the sky look red? Due to the angle of the sun, light must pass through more of the atmosphere and more particles than if the sun was higher in the sky. The colors of the visible spectrum that have a shorter wavelength such as blue and purple do not predominate and the sky appears various shades or red.

    Red sky in the morning, sailors take warning; Red skies at night, sailors' delight. Like other weather folklore, this has basis in truth. A reddish hue to the sky shows light from the sun filtered through more water vapor than if the sky appeared blue. The more water vapor in the atmosphere, the more clouds and a better chance for rain and possibly storms. If the red sky appeared to the mariner at night, the bad weather was behind him and it was smooth sailing before him. That’s probably why rainbows are associated with good luck. To see the luminous bands of color, an observer's eyes must be aligned with a source of light and the atmosphere must be moist. Although rainbows are usually seen in the aftermath of a rain shower, they may be seen in foggy areas and those prone to sea spray.

    A ring of light is sometimes visible around the sun or moon. When this happens, it’s because light is refracted through ice crystals in the atmosphere. Another solar phenomenon is the sundog or mock sun. It also produced by refraction of light through ice crystals. When the sun is near the horizon, a sundog would appear as brightly colored spots on either side of the sun.

    Several phenomena are due to diffraction, or light being bent around objects. A bright ring of light may appear to rest on top of the moon when it is viewed through thin, high clouds. This is known as a corona (or crown). A similar effect is possible with the sun, but because the sun is much brighter, it is more difficult to discern. Iridescence is another diffraction phenomena. It occurs when droplets of different size are present within a cloud. The clouds, especially the ones near to the sun, can appear pink, blue or green!

    And that's all I have to say on that subject. I'm am now on my way to find out why when you drink purple grape juice it comes out yellow.

    Source(s): NOAA's National Weather Service
  • 1 decade ago

    Basically, due to the elements in our atmosphere, and the dust in the air, the sky is blue... Without the atmosphere we have, the sky would be black.


    It says: "Our sky is colored because our atmosphere makes blue light when sunlight passes through it. This phenomenon is called "scattering." It is similar to when sunbeams reveal themselves in the presence of dust, most spectacularly in cathedrals. The atmosphere causes the sky to be colored. "

  • keys
    Lv 4
    5 years ago

    the blue colour of the sky is as a results of Rayleigh scattering. As mild strikes through the ambience, a tremendous kind of the longer wavelengths bypass immediately through. Little of the crimson, orange and yellow mild is stricken by using the air. notwithstanding, many of the shorter wavelength mild is absorbed by using the gas molecules. The absorbed blue mild is then radiated in diverse instructions. It receives scattered all around the sky. Whichever direction you seem, a number of this scattered blue mild reaches you. because you be conscious the blue mild from everywhere overhead, the sky seems blue.

  • Anonymous
    1 decade ago

    sunlight splits into rainbow colours as it enters the earth's atmosphere. the voilet part escapes to space. and the blue and the lower colours enter earth. during sunrise and sunset only red light enters and even the blue light escapes. so everything appears reddish. it is all due to different wavelengths of the diiffrent colours.

  • 1 decade ago

    See all colors have wavelengths and since blue is the shortest then it's defused up 10 times more.

    Source(s): Annoying Girl Scout commercial
  • 1 decade ago

    only the blue light waves manage to reach human eyes after diffraction of sunlight from the atmosphere and dust particles.

  • 1 decade ago

    Due to diffraction of sunlight on the dust particles

  • Anonymous
    1 decade ago

    something to do with the atmosphere and how it traps light i think... the blue is the spectrum of light that is visible ... or something like that

  • 1 decade ago

    because the Oxygen (H2O) mixes with the Nitrogen and other gasses in the air

    Source(s): im a science geek, whoopdiedoodah
  • 1 decade ago

    It was depressed from the loss of its lovely cloudcover.

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