why is the sky blue?

Answer 1

because i think blue is the best color that can give us comfort
and you must ask from god

Answer 2

During daylight the sky has the appearance of an opaque blue surface, but this is the result of the air scattering sunlight. [1]There is no "blue object" above the earth in any normal sense, so it is hard to say what object the sky is. The sky is thus sometimes defined as the denser gaseous zone of a planet's atmosphere. At night the sky has the appearance of a black surface or region scattered with stars. But if we then say that the sky is the entire visible universe, it would not be the same thing we see during the day. The color of the sky is a result of diffuse sky radiation. On a sunny day the Earth sky usually looks as a blue gradient — dark in the zenith, light near the horizon (due to Rayleigh scattering). It turns orange and red during sunrise and sunset, and becomes black at night.

hope that helps
/kevin

Answer 3

We have to go all the way back to the Sun for this one. Let's imaging the path of a photon (particles of light). The photon first makes its difficult journey from the Sun's core to its surface, this takes a million years. However, once the photon is out of the Sun, it moves at a swift speed of 300 000 km/s towards Earth, that takes 8 minutes and 20 seconds.

When the photon reaches the Earth's atmosphere, the photon is disrupted. Particles of the Earth's atmosphere will scatter the photons, changing their direction. The shorter wavelengths (blue and violet) gets scattered the most. You may think that sunlight is white, but it is actually made up of all the colors of a rainbow. When the wave of photons hit the Earth's atmosphere, the longer wavelengths red, orange, yellow, and a bit of green are barely scattered, while the shorter wavelengths blue and violet gets scattered. So what this means is that the longer wavelengths will mostly continue its straight path towards you (imagine you're looking at the Sun, but don't actually look at in), so those colors you will see in the direction of the Sun. The shorter wavelengths however, will bounce off particles in the atmosphere and continue to do so until it reaches your eye , due to the fact that those photons are bouncing off particles, they can reach you at any directions.

That's why the sky is blue, you're looking at the shorter wavelengths from the Sun that's scattered so that they reach you in another direction.

Now, when the Sun is low in the sky, the Sun's light will have to move through a thicker atmosphere, that means more scattering, in this case, even the orange and red lights are scattered a lot, so that's why the sky near the Sun is orange or red during sunrises and sunsets.

Answer 4

The sky is blue because of a number of reasons

a. First, it is contains a lot of tiny particles which make the UV light refract. And in the end, the blue light is unchanged - therefore it appears that the whole sky is blue.

b. This statement is not true for Cairo in summer afternoon.

c. Maybe blue is the favourite colour of God.

d. And pardon, blue sky is only for a clear day - not for city-skies.

Answer 5

You look at the sky and think it is blue. In fact it does not have a color. The color depends on the properties of the elemst that form the sky and on the light that is incident on the sky.

Answer 6

The sun's rays hit the Earth's atmosphere, where the light is scattered by nitrogen and oxygen molecules in the air. The blue wavelength of this light is affected more than the red and green wavelengths, causing the surrounding air to appear blue. At sunset, the sun's light passes farther through the atmosphere, deflecting and decreasing the blue in the air. Scattering by dust particles and pollution in the air causes the sunset to appear red

Answer 7

The sun's rays hit the Earth's atmosphere, where the light is scattered by nitrogen and oxygen molecules in the air. The blue wavelength of this light is affected more than the red and green wavelengths, causing the surrounding air to appear blue. At sunset, the sun's light passes farther through the atmosphere, deflecting and decreasing the blue in the air. Scattering by dust particles and pollution in the air causes the sunset to appear red.

Answer 8

The sky is blue because certain molecules (atoms) are scattered within the atomosphere.
When transmitted light such as sunlight enters our atmosphere it collides with the oxygen and nitrogen atoms. The color with the shorter wavelength is scattered more by this collision. Because violet and blue are the shortest wavelengths the sky appears to be violet / blue. But because our eyes are more sensitive to blue light than they are violet light, we perceive the sky as blue

Answer 9

Because air is blue!

"The sky is blue because air is a powdery blue material, and when the sun shines on it, you can see this blue color. Each molecule of air behaves like a bluish-looking mote of dust. Stare upwards on a sunny day, and you're looking into a thick cloud of air. (There really is no "sky" up there. You're not looking at a blue surface. Instead you're just seeing the Earth's layer of blue air against the blackness of outer space. )"

Answer 10

Difference in the refractive index for different wave lengths of different colours of lights. Thus, while red and violet light is refracted in a way to make its intensity reaching us insignificant compared to blue in the morning. In the evening, the reverse happens and the sky appears red or oragne, ...

I think!!!

Answer 11

The sunlight of the sun hitting the Earth's atmosphere, thus the blue wavelight scatter all over the atmosphere. You can go to this website for more info.
http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html