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why does sky appear black instead of blue 2 the astronauts? 

Hi Uday!

The sky appears blue, when viewed from Earth, because of the scattering of the light. Scattering is the phenomenon by which a beam of light is redirected in many different directions when it interacts with a particle of matter. When sunlight strikes molecules in our atmosphere, the light is redirected in many directions. The blue light is scattered more than the red light causing the sky to be blue.

In the space, there is no atmosphere. So, light will not scatter in space. This is the cause of dark sky when viewed from space.

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because there is no atmosphere  to scatter light in the space.

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 Sky appears black to an astronaut because there is no atmosphere in space and so there are no particles to disperse light from the sun.

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Because the sky is blue to us by the light being scattered through nitrogen. In space there is no nitrogen for the light to scatter through, therefore the sky around them seems black. Although, when in space if you look at the earth, you can see the blue sky, as there is nitrogen there.
Because the sky is blue to us by the light being scattered through nitrogen. In space there is no nitrogen for the light to scatter through, therefore the sky around them seems black. Although, when in space if you look at the earth, you can see the blue sky, as there is nitrogen there.
 
 

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