Why does the sky look blue?

Everyone knows that the sky is blue, but not everyone knows why it is blue.

In the sky above our planet, there is a thick layer of atmosphere. Air has no color, so what about blue?

Sunlight is dispersed by light to form seven colors: red, orange, yellow, green, blue, indigo, and violet. Red light is the strongest, orange, yellow, and green are also stronger, and the weakest are blue, indigo, and violet.

When the sunlight penetrates the thick atmosphere, the red light runs the fastest and passes through it at once; followed by orange, yellow, and green lights; Most of the blue and indigo light is trapped by the atmosphere, and they are pushed around by the dust and water droplets in the atmosphere, and they are reflected back and forth (and finally enter our eyes) and the result is that the sky is blue. (i.e., the "Rayleigh scattering" effect).

The sky is blue from the ground, but if you look out at the sky from an airplane, the sky is even bluer. If you take a spaceship to a higher place to look at the sky, then the sky is not blue, but purple, because of the weakest violet light, most of them can't even enter the first door of the atmosphere.

The sky was originally colorless, but due to the dispersion of the sun's rays, it had color. And that's why the sky looks dark at night. At night, the sun does not shine on this half of the earth's sky, and without strong sunlight, the sky has no color, and some, it is only black.

Of course, there is also the light of the moon and the stars, but the moon does not shine, the light of the moon reflects the sun's light, of course, it is not bright, and the stars are too far away from us, so the night sky we see will not be as bright as the day.

First of all, understand how light works, as light travels from the sun, it moves up and down like ocean waves, and when the wavelengths come together, we appear as if they are white.

The ancients moved their hearts and moved ......

So the heart is blue and blue......

The blue sky is blue because the blue part of the sun's rays is more scattered in the air than it is to scatter the red rays.

The locust sunset at dusk is red and orange because the blue light is scattered and travels beyond the line of sight.

Sunlight is composed of seven types of light: red, orange, yellow, green, cyan, blue, and violet. Among the seven types of light, cyan, blue, and violet wavelengths are shorter and are easily scattered by air molecules and dust.

Sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue, and purple. The wavelengths of light in these seven colors are not the same. Dust and other particles in the atmosphere have a stronger ability to scatter light in short waves, while blue light has a shorter wavelength, so it is scattered when it reaches the atmosphere.

As a result, the sky appears blue. Using the phenomenon of "scattering", you can explain the following celestial phenomena:

For example, the sky above you is blue, but where the horizon meets heaven and earth, the sky looks almost white. Why? That's because sunlight travels a lot farther through the air than it does if it falls straight from the sky—and it grazes with many more particles along the way.

These large numbers of microparticles scatter light many times, so it appears white and light blue. It is recommended that you do a little experiment to verify this: take a glass of water, put it in a dark background, put a drop of milk, and then take a flashlight to one end of the cup, and close to it, the light of the flashlight will appear pale blue in the water.

If you put more milk into the water, the whiter the water will become, because the light is scattered again and again by these numerous milk particles, and the result is white. It's the same as being white above the horizon. Since 79% of the earth's surface is made up of oceans, it is reflected and refracted to form a blue color on the surface of the sky.

Because the sky will be blue due to the reflection of sunlight, blue light is not as reflective as red.

Because the dust is stained with water droplets in the air, and the sunlight reflects blue, the sky is blue.

Because sunlight is dispersed by light to form seven colors: red, orange, yellow, green, blue, indigo, and violet. Red light is the strongest, while blue, indigo, and violet are the weakest.

When the sunlight penetrates the thick atmosphere, the red light runs the fastest and passes through it at once; followed by orange, yellow, and green lights; Most of the blue and indigo light is trapped by the atmosphere, and they are pushed around by the dust and water droplets in the atmosphere, and they are reflected back and forth (and finally enter our eyes) and the result is that the sky is blue.

Because of the loess, the green water. Castle peak. Everything reflects the blue of the sky! Thank you!