When you see the photo that I uploaded in this post, of course you will see one of the natural phenomena that is very beautiful, this is in accordance with the dashing sky and sea and the mountains that stand connected to each other then you conclude that nature is very beautiful and manly.

But I see photos from the other side like the colors embedded in the mainland sea sky, but what really stands out is the blue sky color.

So with that implied one question that is often asked by every student to his teacher, such as Why is the sky blue have you ever thought so? Or is the sky really blue?

Indeed, if you look at the sky from the direction of the earth, of course see the sky is blue, this is clearly seen by humans. But basically if you are nearby, then you do not find the blue color as seen from the direction of the earth.

In this case the experts answer this because,

The sky can be blue because oxygen and nitrogen molecules in the earth's atmosphere spread more blue waves (short wavelengths) than red waves (long wavelengths).

The reason said by the experts is very precise and very ratio, because the sky is not only blue but there are also other colors. This you can see when in the morning, then when we will see the different colors of the sky. In general there are red, orange, to violet. Well ... The effect is because the blue light has spread out and away from the analysis of our eyes in observing from a very far away direction, or looking from the direction of the earth.

Then people also ask, then why does the atmosphere spread?

because the electromagnetic field of light waves induces an electric dipole moment in a gas molecule.
So in this case for ordinary people it is sometimes very difficult to understand, because what looks different is happening, because it is related to physics that is sometimes difficult to digest by the minds of ordinary people.

So in this case you need to know that the spectrum of colors consisting of red, orange, yellow, green, blue, indigo and violet like the color of the rainbow, is the impact of the light field that blends when it happens. However, in my eyes the color purple is not included in the color spectrum because it is said purple is not included in the light.

Well ... That's the answer to the statement written above, maybe you can also answer it when your child asks the same thing. That is why if you look at the blue sky above the sky, if you look from the direction of the earth, you will see other colors if you are near the sky. Thus in my opinion and thank you.