The answer to the question "What color is the sun actually?" It seems obvious - yellow. To make sure this is enough to raise the eyes on a blue sky and see a bright yellow circle ... But not everything is so simple, as it seems at first glance.
True sun color - white. But the star seems to us yellow because of the atmosphere of our planet. The fact is that the white color of the Sun is obtained as a result of a combination of light waves of different lengths. And if you decompose the waves on one, then it turns out a peculiar rainbow - the length of each wave will designate its color. The shorter the wavelength, the greater the likelihood that the light wave will obscure the gas molecule in the atmosphere and bounce out in another direction, in other words, dispel. But long-wave colors without problems bypass the molecules of gases and get to the retina of our eye. If you look at the picture below it becomes clear why we are watching the sun yellowness than it really is. Blue and purple colors are dissipated, and red and yellow reach the surface.
If the sun bends to the sunset, its rays are directed towards the earth's surface by tangent, and they need to overcome much greater distance through the atmosphere. Accordingly, even more light waves will be scattered by the atmosphere and will reach us the most persistent and most red colors.
Where is the color of short light waves? It dissipates in the layers of the atmosphere in different directions many times, because the sky and takes the blue shade. The higher from the ground, it becomes darker - gas molecules, scattering light, becomes less. Now we know why our sky is blue.
But after all, judging by the picture with the lengths, the waves of purple color shorter the waves of blue or blue. Why then our sky is not purple? Here, our eyes are played a big role, which are much more sensitive to perceive shades of blue, rather than purple. In addition, most purple rays are dissipated still in the upper layers of the atmosphere.
As can be seen from the article, to answer simple, it would seem, the questions, like "what color is the sun?" Or "why the sky is blue?", Humanity had to go far to their knowledge of physics, chemistry and astronomy. Modern science helps us a new look at the usual things about which people who lived a few centuries ago did not even think.
It's interesting: Traffic lights, emergency light bulbs and all sorts of signal beacons are not shining red. It is this color that the least dissipates in the earth's atmosphere.