Why is the sky blue for the body??????

The blue color of the sky is a natural phenomenon caused by the refraction of sunlight in the atmosphere.

Blue is one of the cool shades, blue can make people feel cool, comfortable, and sometimes feel cold ......

If a person's melancholy mood is compared to blue, I think it may be the cool, cold meaning of it. Because at that time, people's mood was very low and dazed, as if they had lost the direction of their life at that time. If you see blue at this time, it will make your mood more melancholy......

For personal opinions, please refer to other friends' opinions.

A person's emotions will change, this is a very normal psychological phenomenon, don't worry too much about bad emotions, try to regulate, because every zone will have sunshine.

Because light with longer wavelengths (such as red light) is less likely to be scattered when light of different wavelengths passes through the atmosphere, while light with shorter wavelengths (such as blue light) is more easily scattered, the part of the sky away from the sun is blue, and when it is close to the sun, it is white and yellowish.

The sun shines directly on the earth, which is actually a mixture of seven colors. Sunlight is dispersed by light to form seven colors: red, orange, yellow, green, blue, indigo, and violet.

When sunlight passes through the thick atmosphere, it passes through the atmosphere at once because the red light is the strongest and the fastest. Orange, yellow, and green are also stronger, and they also pass through the atmosphere very quickly. They followed through the atmosphere and soon dispersed.

The weakest are blue, indigo, and violet. Blue and indigo are too weak in luminosity, but it is difficult to pass through the thick atmosphere of the earth, so most of the blue and indigo are detained by the atmosphere, and they are pushed around by the floating dust and water droplets in the atmosphere, and the reflection (and finally enter our eyes) results in the blue sky (i.e., the "Rayleigh scattering" effect).

Let me tell you about it, when we look at the sky from the ground, we look out at the sky from an airplane, and the sky is bluer, which is what we call indigo. When you take the spaceship to a higher place and look at the sky, the sky will no longer be blue, but purple. It's black up there.

Why? Because of the violet light, which is weaker than blue light, most of them can't even enter the first layer of the atmosphere. So it can only stay in the sky higher above our heads.

Needless to say, black is not a component of sunlight. It is the dark energy of the universe.

If necessary, I still have to say, why is the sky not blue at night? That's because at night, the sun doesn't shine enough on half of the earth's sky, and because of the lack of strong sunlight, the sky has no color, and all you can see is the dark and black light of the moon and stars.

In addition, the moon does not shine, its light is emitted by reflecting the sun's light, and its brightness is very different from that of the sun. Its luminosity is not enough to receive it on the ground, let alone in the atmosphere. And the stars are so far away from us that they are so different from the moonlight that they are like an oil lamp, not enough to light up the playground of our school in the dark night.