An astronaut is in outer-space, so technically they're not looking at the sky, their either looking at the earth or out into the universe.
lol. ask an astronaut.
The real color of the sky is black .
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.
However, 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.
Dark Side of the Rainbow, Dave Kopel::
That so many beginning times appear to “work” reinforces the conclusion that Floydian albums create their own synchronicities. Does the fact that Dark Side
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All of this happens in the atomsphere .The astronauts are out the atomsphere so they don't experience the whole matter.They just see it black as it is .
I hope this helps
Light reflecting off our oceans and being trapped in the stratosphere where the gasses make the colors illuminate. Thats also somewhat like the way you see rainbows.
the sky is a reflection of the ocean, in which light rays are reflected from the ozone layer and other spheres of the earth, back down into the eyes of the people on earth. an astonaut in space does not see the light because it is not reflected in their direction. Light From Above - 'Stellar' Quotes::
"We had the sky up there, and we used to lay on our backs and look up at them, "We're all in the gutter, but some of us are looking at the stars."
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Contrary to the suggestions of several users here, the blue color of the sky has nothing to do with the oceans. If that were true, the sky inland would be brown, or at least browner.
Instead, the blue color of the sky has to do with an effect known as Rayleigh scattering. This phenomenon occurs when light passes through a region in which the refractive index (the degree to which a material bends or "refracts" light) changes on a scale similar to the wavelength of the light. In the Earth's atmosphere, sunlight passes through microscopic regions of fluctuating air (with a fluctuating refractive index); hence, this sunlight is scattered.
Goodbye Blue Sky’s Journal – Last.fm::
Goodbye Blue Sky appears on the album The Wall (disc 1). Pink Floyd, formed in 1965 in Cambridge, No, but is pretty fun. 06. Who does #38 remind you of?
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Critically, however, the effect depends greatly on the wavelength of the light. Recall that red light has a relatively long wavelength, while blue light has a relative short wavelength. It turns out that shorter-wavelength light is more strongly affected by Rayleigh scattering in our atmosphere, causing the bluer shades of sunlight to be scattered far more than the redder shades. This causes the blue light from the sun to appear to come from all over the sky, while the rest of the colors mostly appear to be confined to the sun's disc.
When the sun gets low on the horizon, its light must pass through more atmosphere before it reaches our eyes. This means more Rayleigh scattering, to the point that blue light is scattered all the way to the other side of the sky, and even the long-wavelength red light is scattered a bit near the sun. The net result of this is that the sun's half of the sky appears red, while the rest of the sky appears blue.
(On a related note, lunar eclipses appear red for the same reason. A lunar eclipse occurs when the sun passes directly between the sun and the moon, blocking all of the sun's light. However, around the very edge of the Earth's disc (as viewed from the moon), sunlight from all the world's sunrises and sunsets is refracted through the atmosphere, allowing it to essentially bend around the Earth and illuminate the moon a dim shade of red. This light reflects off the surface of the moon back to the Earth, and we see a red moon.)
Of course, outer space is black, since most of space is empty. Astronauts are above the Earth's atmosphere, so there's nothing to scatter sunlight. Thus, they perceive the true blackness of space, even in the full glare of the sun.
The sky is blue from the surface of the Earth because the wave length of blue is diffused through the layers of the atmosphere. In space if a viewer is in open sunlight, the strong radiation of the sun's light washes out the dim star-light, it can't be seen.
 Why the sky is usually blue in color in normal conditions at day time ?
 Why do water and the sky look blue, when in reality, air and water are normally clear?
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Why does sky look blue to us but appear dark to an astronaut?