Why is the sky blue?

atmosphere

it isn't. It's a reflection of the earths water.

It's been having a bit of a rough time lately.

It's the reflection of the water on the atmosphere.

Would you prefer it to be:
Purple
Yellow
Red {like the red planet}
Orange.

Dumb question if you ask me..

The light from the sun is actually made up of an entire spectrum of colors. the molecules in the atmosphere cause it so you see the blue ones instead of the others. when you see the sunset/sunrise and you see the other colors, it is because the sunlight has to come a further distance and gets scattered more. I don't know if that helped answer much or if it just confused you, but here's a website that will give you all sorts of good info on it! http://math.ucr.edu/home/baez/physics/ge.

mrs_empo you have it wrong, the sea is blue because it reflects the sky, not the other way around. The sky is blue due to the result of sunlight being scattered by the air. I think the nitrogen in the air scatters blue light, which is why it appears blue.

because of atmosphere and changes in temperature

It's the reflection of the water on the atmosphere

because of the reflecion of the sea i think! But then why is the sea blue? Could that be the reflection of the sky!

Because green was taken! Seriously, it's just the way the light reflects in the atmosphere. Like the denser the clouds, the darker they become. When the sun sets, the sky turns pink. It's all about light my friend. At night, the sky is black.

The sky is blue due to the atmosphere, not the reflection of the seas and oceans.

The particles in the atmosphere act like a prism, filtering and scattering light waves. For the most simplistic answer, the sky is blue because the atmosphere refracts the light waves in a way that appears to make the sky blue, which it really isn't. That's why we see different colors as the sun lowers. The "prism" angle of the the sky has been changed, and we see different colors.

It most definetly has nothing to do with the ocean, Why is the sky still blue above land if that were true, it is blue because Blue light being the longest visible light in the electromagnetic spectrum and scatters the least when going through the earths atmosphere. Most other shorter wavelengths scatter and are deflected away from the earth, this phenomena is known as diffuse sky radiation.

and why is the Mars sky red? :)

It is NOT a reflection of the earth's water. It is the reflection off the molecules in the atmosphere. That is why you have beautiful sunsets after a volcano is because there is more "stuff" in the atmosphere and the sun reflects off each thing differently.

it just appears to be that way. It's the reflection of the earth's water.

Because air is blue. That's all.

By the way its not a dumb question its a gr8 question good to see some people can think out of the box most would not care why its one colour or another
It's nothing to do with the water in the ocean's ignor that, think if you were stood in the middle of a desert with no water for thousounds of miles if you looked straight up above you the sky is not desert coloured it's still blue below was taken form Wikipedia

The sky is blue partly because air scatters short-wavelength light in preference to longer wavelengths. Combined, these effects scatter (bend away in all directions) some short, blue light waves while allowing almost all longer, red light waves to pass straight through. When we look toward a part of the sky not near the sun, the blue color we see is blue light waves scattered down toward us from the white sunlight passing through the air overhead. Near sunrise and sunset, most of the light we see comes in nearly tangent to the Earth's surface, so that the light's path through the atmosphere is so long that much of the blue and even yellow light is scattered out, leaving the sun rays and the clouds it illuminates red.
Scattering and absorption are major causes of the attenuation of radiation by the atmosphere. Scattering varies as a function of the ratio of the particle diameter to the wavelength of the radiation. When this ratio is less than about one-tenth, Rayleigh scattering occurs in which the scattering coefficient varies inversely as the fourth power of the wavelength. At larger values of the ratio of particle diameter to wavelength, the scattering varies in a complex fashion described, for spherical particles, by the Mie theory; at a ratio of the order of 10, the laws of geometric optics begin to apply.
Why is the sky blue instead of violet?
Because of the strong wavelength dependence (inverse fourth power) of light scattering according to Raleigh's Law, 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. Simply put, the human eye cannot detect violet light in presence of light with longer wavelengths. There is a reason for this. 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 three color sensors (identified here as long (L), middle (M), and short (S) wavelength), three roughly "bell-curve" distributions 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. For example, monochromatic violet light at 400 nm mostly stimulates the S receptors, but also slightly stimulates the L and M receptors, with the L receptor having the stronger response. This combination of stimuli is interpreted by the brain as violet. Monochromatic blue light, on the other hand, stimulates the M receptor more than the L receptor. Skylight is not monochromatic; it contains a mixture of light covering much of the spectrum. The combination of strong violet light with weaker blue and even weaker green and yellow strongly stimulates the S receptor, and stimulates the M receptor more than the L receptor. As a result, this mixture of wavelengths is perceived by the brain as blue rather than violet.

Just a comment on mrs_empo's answer! It's not a reflection of the sea, thats why the sae is blue, a reflection of the sky!

well wouldn't u b if u were all alone up above?

cause the suns rays create the colour through the earth's entry point

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Why is the sky blue?

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