why the sky is really black and how the only reason it is blue in the day is because it reflects from the sun?

Why is the sky blue

When it comes to the color of the sky, the first thing that occurred to us is blue, although discolored change different times of the day, we see in color from ranging from dark indigo to red or orange color in the times when the sun ,, and in view of the fact that the sun sets a source of light located on the ground, and the light that issued white, thought that the sky blue color raises the question and exclamation really

It is known that the white color is caused by a combination of the seven colors of the rainbow that looks at the rainbow and are (red, orange, yellow, green, blue, indigo, violet) and which is caused as a result of the different radiation consisting of light. As the visual material lengths yields a color from sunlight with different lengths.

 This and some of the material is characterized by its ability to reflect light or absorb or make it refracts in different directions. (With the exception of completely transparent material will allow the passage of light as it is)

 For further clarification, Article red, for example, when exposed to light they absorb all colors of the spectrum except for the color red, which is otherwise the. Article radiation and reflect some red and some blue. The white matter, it reflects all the colors of the spectrum and black absorbs all

And when the light beam passing through the air, it is exposed to the refraction of a certain degree so that degree depends on the amount of dust around it. And break the blue waves (short waves of the spectrum) is much larger than the refraction that occurs long waves degree (red). On a clear day in which the water droplets and dust at least, have very limited rays of light, reflection and a result, we see rows of light blue sky

 But in times of sunset, the amount of dust in the atmosphere increases, especially the days of harvest, leading to increased light scattering, especially short-wave blue, so keep radiation phenomenon on the surface of the earth is red and orange.