in the sky  our colours are real colours or not?
398344
Color is a function of the wavelength of light reaching an object and the reflective properties of the object. If the illumination is a different color, the object will have a different color.  Let's assume white light to be the standard, then a color will be the same if you are near an object whether there is air or not.  If you are at the surface of the earth and the object is in the sky, atmospheric effects will change the color possibly (like our blue sky).
371401
The sky has no color. The color that you see depends on the reflections from the ocean and other bodies of water and the suns ability to cause a reflection on the water.
160214
They also occur as a circle, if you're in a plane (i was in a microlight) above mist/cloud it's the most spectacular sight, I looked down and there was a circular rainbow. It has to do with the fact that you're viewing it from one point, all the rainbow is relative to you.
563373
it all depends....\n\nthe color of the sky depends on the weather...ranging from light blue to dark gray...or black at night\n\nthe color of the grass depends on how dry it is...usually it's varying shades of green but if it's really dry...then baige or brown-ish\n\nthe sun is yellow
1056723
The sky is blue due to the way that light is bent, it's called Rayleigh Scattering.  Sunlight is white and white light consists of all colors but when it hits our atmosphere the light is broken up into it's component colors by the particles in the atmosphere.  The shortest wavelengths don't make it through the particles but the blue light does - hence the sky appears blue when in fact it has no color ro it (it is after all, nothing but air and water).\n\nAs others have said - grass is green because of chlorophyll - the chemical in all plants and it just happens to be green.
87869
The sky is technically clear - this can be seen on any clear night. The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.\n\nHowever, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.
1015359
using simple physics\n\nThe blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.\n\nthe grass is green because the other colors are absorbed and only green is reflected. Grass and most other plants are green because they contain a pigment known as chlorophyll.\n\nSun isn't really yellow. The color yellow is a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex.
242740
I've heard that the sky turns a type of dirty greenish greyish colour before a severe hailstorm, or a tornado.  But I'd like to think that the sky would do that because of the types of clouds, and the absorption and reflection of light.  I've never seen it myself to say for sure. \n\nI've also been told that there are green flashes that apprear on the sea (but the sea level has to be right) around sunset.  I've never seen one of those either. Apparently, it's one of those must-see things.\n\nAnd then again, another place where greens exist is in the northern lights (Aurora Borealis)...  There are greens and they're gorgeous.  Now I've witnessed that, and it's simply GORGEOUS!!\n\nlike you said, there's always the good old rainbow!  I've seen that too :p\n\ncheers!!
59243
The light during the day comes from our star, the sun. The sunlight has to travel through air to get to us. The sunlight looks white, but it has many colors in it (for example, a prism or a rainbow breaks the sunlight into its colors so we can see them). \n\nSome of the blue part of the sunlight cannot go through the air without getting bounced around first by the air, and so it makes it look like the blue is coming from the air in the sky instead of the sun. That is why the sky looks blue.
1038358
I answer this question nearly every day.  *sigh*  :) :)\n\nThe blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. \n\nHowever, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. \n\nAs you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.
617565
The water particles,mixed in the air ( sky ), are responsible for this.The sunlight is refracted by those water molecules and thus we see the colour of the sky as blue.As you may remember,in the rainbow colours,Blue comes just after Violet and Indigo which are not that prominent as Blue. \nThus we see the sky blue.
900269
there are defferent sphares of light.   White light comes from the sun and when it hits the atmospher it splits into different colors of the rainbow.  Blue being the fastest light is the only light that escapes the atmospher and that is what makes a blue sky.  Blue skies also mean clear skies.  now a red sky means lots of deferent types of air in the sky.  in the morning the sun is just starting to warm up the atmospher.  so you have a lot of defferent types of air going to get charged up.   Think of it like starting all the appliences  in your kitchen starting up but you don't know what they are gonna do.  basically you get speratic weather.  As apposed to a blue sky getting warmed up.  All it does is warm up the air.    \n \nhope this helps\n-David-
245658
Yes, from a physics perspective there are an infinite number of colors.\n\nBut from the perspective of your retina, there are a finite number that you can perceive, in the thousands as I recall.
267281
Well.........\n\nThe blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. \n\nHowever, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.
1102291
How can you prove the color Blue is Blue? what if it is really yellow, and all along we have been calling it Blue?\n\nSome one must have tought me that Blue is Blue, and I never stoped calling it blue. It's blue because no one every proved other wise. It's what I was raised with, calling it Yellow would sound funny to me and others, no one would understand me.\n\nI think we are born, we learn every thing we can, and we then put the peices in as we can understand them. \nI dont know if I am real or not, but I choose to beleive I am, for what reason is beyong me, perhaps I was raised to think I am real, and so I am. I cant prove it either way, Im just comfortable thinking that I am.
897313
yeah of course its in colour is it not.
108304
>>>>> Colors are just light waves that are traveling at various speeds.\n\nUmm, the speed of light in any medium is a CONSTANT. Light waves emitted by objects in air can't travel at various speeds. There is only one lightspeed in air.\n\n\nAnyway, colours 'came about' as an inherentpart of the setup of the universe. There is no other answer. You might just as well ask how height came about. It's an inherent function of our universe. If it were any othr way it seimply wouldn't be our universe and we wouldn't exist to realise it had changed.