Sky is Blue
As the wavelength of light falls, Rayleigh scattering—caused by these tiny air molecules—increases. Red light has the longest wavelength, whereas violet and blue have the shortest. The sky appears blue during the day because blue light is scattered more than red light.
Real color of sky
Technically speaking, the sky is actually a bluish purple color because the short wavelengths that scatter across it correspond to the colors blue and violet. We perceive the sky as blue because our eyes' cone cells, which sense color, aren't particularly sensitive to violet.
Scattering of light
The Sun's light appears to be white. However, it actually consists of every color in the rainbow.
White light splits into all of its colors when it passes through a prism. A prism is a crystal with a unique shape.f you've been to The Land of the Magic Windows, you may have discovered that the light you see is only a small portion of all the different types of light energy that are radiating around the universe—and around you! Light energy moves in waves, just like energy moving through the ocean. In some cases, light moves in brief, "choppy" waves. Long, languid waves carry other light about. Compared to red light waves, blue light waves are shorter.
When sunlight enters the atmosphere of Earth, all the gases and airborne particles scatter it in all directions. The microscopic air molecules in the Earth's atmosphere disperse blue light in all directions. Do to the shorter, smaller waves that blue uses to travel, it scatters more than other colors. This explains why the sky is typically blue.
The sky changes to a paler blue or white as it gets closer to the horizon. Even more air has been used by the sunlight that is reaching us from low in the sky than by the light that is coming from above. The air molecules dispersed and re-scattered the blue light numerous times in various directions as the sunshine traveled through all of this air.
The light has also been reflected and dispersed by the Earth's surface. We perceive more white and less blue as a result of all this scattering, which again blends the hues.
Physics Reason[The Sky is Blue]
The mechanics of how light moves through the atmosphere at different times provides the solution. When light rays strike air molecules, they disperse in all directions, with blue light being more strongly scattered than other colors.
Even in the sun, the sky in outer space, above the Earth's atmosphere, appears to be completely black. One of the most notable occurrences that passengers on suborbital flights operated by Blue Origin have seen is that.
William Shatner tried to describe his experience by saying, "To see the blue color go right by you, and now you're staring into blackness, that's the thing," after his flight. The color of blue, he continued.
This darkness is simple enough to comprehend. There is no need for the sky to be lit up at all unless you're facing the sun directly. Its illumination down here on the planet's surface is the actual mystery; it wasn't entirely clarified until the end of the 19th century.
The Rayleigh scattering effect—named for its discoverer Lord Rayleigh—holds the secret. This describes how light reflects off tiny particles, including the molecules that make up the Earth's atmosphere, up to about a tenth of the wavelength of the light itself.
Longer wavelengths, which correlate to the red end of the spectrum, aren't as highly scattered as short wavelengths like blue and violet, as demonstrated by Rayleigh. Because human eyes are more sensitive to blue and because the sun generates less violet light to begin with, blue predominates over violet among those two colors.
It's not always blue in the sky. At sunrise or sunset, when the sun is low in the sky, it can appear crimson. The same physics that explains why the sky is blue at other times—Rayleigh scattering—also explains why it is blue at this moment.
In contrast to when the sun is high in the sky, when we look toward the sun at sunset, we see light that has gone further through the atmosphere. We can only see what's left, since the majority of the shorter wavelengths have been scattered away.
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