why is the sky blue?

Answer 1

Rayleigh scattering (named after Lord Rayleigh) is the scattering of light, or other electromagnetic radiation, by particles much smaller than the wavelength of the light. It occurs when light travels in transparent solids and liquids, but is most prominently seen in gases. Rayleigh scattering of sunlight by the atmosphere is the main reason light from the sky is blue.

Answer 2

Why is the sky blue?” may seem to be a simple question, but it actually touches some of the deepest aspects of astronomy and skygazing because it deals with light. “Seeing” something whether it’s a table across the room or a galaxy millions of light years away consists of light entering our eyes and the brain taking the light and creating a picture within our brain. So before asking the question “Why is the sky blue?”, it’s necessary to know the answer to the question, “What is light?”
What Is Light?
Light consists of weightless particles (that contain no mass) traveling at about 186,000 miles or 300,000 kilometers per second. These particles of light are called photons. But light also exhibits the characteristics of a wave. Traditionally, wave activity is explained by imagining a pebble being dropped into a lake, but that imaginary lake has been filled with imaginary pebbles years ago. So instead, imagine a long rope tied to the side of a wall and a girl shaking rhythmically one end of the rope up and down. Each up and down shake of the rope is a cycle and the number of cycles per second is the wave’s frequency. If you observe the rope from the side, you will see a wave pattern of alternating crests and troughs. The distance from one crest to another is the wavelength. When the girl shakes the ropes more rapidly, the frequency will naturally increase, but the wavelength will shorten. Light acts in many ways similarly to the shaking rope. It also has a frequency and a wavelength. As the frequency increases, the wavelength decreases and as the frequency decreases, the wavelength increases. The frequency of light determines its color. Blue light has a higher frequency and a shorter wavelength than red light. Our eyes are sensitive to only a small part of the spectrum of frequencies. There is ultra-violet and infra-red light just beyond our eyes’ range, radio waves with much lower frequencies than light, and gamma rays with much higher frequencies. Sunlight contains many different colors which can be separated through a prism or a rainbow into different colors.
In short, keep in mind the following three facts:
Light must enter our eyes in order for us to see it
The Sun emits light with different colors
Different colored light has different wavelengths
Sunlight and the Atmosphere
The atmosphere around the Earth is largely made up of two colorless gases: oxygen and nitrogen. Red and blue light reacts very different from each other to oxygen. Because the wavelength of blue light is roughly the size of an atom of oxygen, blue light interacts with the oxygen and is scattered by it, while red light, with its longer wavelength, goes right pass the oxygen atoms. If the Earth had no atmosphere, the sun’s light would travel directly from the Sun in a straight line towards our eyes and we would see the Sun as a very bright star in sea of blackness. But because the Sun’s blue light is scattered by the oxygen in the atmosphere, blue light from the Sun enters our eyes from all sorts of different angles and we see the entire sky as blue. The atmosphere scatters violet light even more effectively, but our eyes are more sensitive to blue. Wherever we look towards the sky, some light is bouncing off an oxygen atom and entering our eyes, making the sky appear to be blue.

Answer 3

It has to do with the particles in the white light from the sun being scattered in the atmosphere of the earth. Only certain wavelengths of light can get through. When the sun is perpendicular to where you are standing (middle of the day) shorter wavelengths are preferred, like blue and violet. When the sun is parallel to where you are standing (like at sunset) longer wavelengths like red and orange are preferred.

Answer 4

Light is actually a spectrum of color (you can see it when it is broken up in a prism). The color of something depends on the chemical composition of the object it shines on. Basically, things that are blue absorb red and yellow, and reflect blue. Things that are green absorb red and reflect blue and yellow.

Answer 5

it's blue because all the colors are wave lengths since blue is the shortest wave length it's defused up to ten times more!!!!

Answer 6

Because the grass was already green.

Answer 7

because the grass is green

Answer 8

because it reflects the oceans

Answer 9

cos if it was green it would be grass

Answer 10

because it is lonely : (