why is the sky blue?

Answer 1

reflection of light.

During daylight the sky has the appearance of a deep blue surface, but this is the result of the air scattering sunlight. [1] There is no "blue object" above the earth in any normal sense, so it is hard to say what object the sky is. The sky is thus sometimes defined as the denser gaseous zone of a planet's atmosphere. At night the sky has the appearance of a black surface or region scattered with stars. But if we then say that the sky is the entire visible universe, it would not be the same thing we see during the day.

Answer 2

The answer is simple during the night you don't see blue because you air is transparent and you see right to space

but during the day the light hits the surface of the water (seas and oceans for the most part) and water is blue because it absorbs most colors accept blue which is reflected (or a combination of colors that make up blue) then that is reflected back up towards space but the atmosphere bounces it right back down and you see the blue sky (the color of the sky depends on the light reflected by most of the planet during the day if the oceans were yellow so would be the sky but there blue.)

Answer 3

It is due to refraction, not diffraction. Red is bent the least and violet is bent the most.

When the sun is on the horizon, its light has to travel through many miles of atmosphere before it gets to our eye. Since the blue end of the spectrum is bent the most through refraction, it is completely scattered away by the time the light gets to us. Therefore, the only colors left are the red and orange. This is why sunsets are combinations of reds, oranges, and yellows.

This is also the same reason the sky is blue (no it is not blue because of the reflection of the oceans!) The sun is more directly overhead, so the sunlight doesn't travel through as much atmosphere to get to our eyes. The blue end of the spectrum is still scattered the most, but it isn't completely filtered; thus it illuminates the sky more than the other colors. Actually, since violet is bent more than blue, the sky is actually more a violet color, but our eyes are more sensitive to blue, so we see a blue sky.

Answer 4

Simple. Visible light has seven colours. When it comes into contact with our atmosphere it is dispersed (ie split up and spread). The colour that spreads the most is the colour that is dominant. Red, having the longest wavelength, spreads the least, and violet spreads the most because it has the shortest wavelength.

So why isn't the sky violet?

Because our eyes are most sensitive to yellow, green and blue. And out of these blue is the one that spreads the most. So we see blue.

Answer 5

During sunrise and sunset the Sun's light must pass through a much greater thickness of the atmosphere to reach an observer on the ground. This extra distance causes multiple scatterings of blue light, but relatively little scattering of red light; this is seen as a pronounced red-hued sky in the direction towards the sun.

Because of the strong wavelength dependence (inverse fourth power) in Rayleigh regime light scattering according, one would expect that the sky would appear more violet than blue, the former having a shorter wavelength than the latter. There is a simple physiological explanation for this apparent conundrum. It turns out that the human eye's high resolution color-detection system is made of proteins and chromophores (which together make up photoreceptor cells or "Cone" structures in the eye's fovea) that are sensitive to different wavelengths in the visible spectrum (400 nm–700 nm). In fact, there are three major protein-chromophore sensors that have peak sensitivities to yellowish-green (564 nm), bluish-green (534 nm), and blue-violet (420 nm) light. The brain uses the different responses of these chromophores to interpret the spectrum of the light that reaches the retina.

When one experimentally plots the sensitivity curves for the L, M, and S color sensors, three "bell-curve" distributions with peaks at each of these wavelengths are seen to overlap one another and cover the visible spectrum. We depend on this overlap for color sensing to detect the entire spectrum of visible light. However, when one looks at the bell-curve sensitivity of the short wavelength (S) color sensor, there is a narrow detection band with a rapid fall-off in sensitivity around 450 nm. This means that our eyes are many times less sensitive to violet light (400 nm) than to blue light. As a result, although the scattered light contains more violet photons than blue ones, the physiological makeup of the eye gives a more pronounced contribution to the blue-ness of the sky.

Answer 6

It appears blue because this is the only colour which the atmosphere does not reflect away.

Answer 7

the sky contain ozone, this ozone when light is shown through it appears blue

Answer 8

Particles in the atmosphere create the illusion.

Answer 9

It is the splitting of the light from the sun. Later on in the day it will go red. then when there is no light it will be black.

xxB

Answer 10

The same reason water is blue, your eyes only pick up certain spectrums of light.