Question

The sky appears blue to an observer on Earth while it is dark black for observer in outer space. Justify the statement with help of proper diagram.



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Answer 1

Answer:

Sky appears blue. The molecules of air and other fine particles in the atmosphere have a size smaller than the wavelength of visible light. So these particles scatter more effectively the light rays of shorter wavelenghth at the blue end than light of longer wavelength at the red end. When the scattered blue light enters our eyes, it gives use the feeling of a blue sky.

Colour of sky to an astronaut. There is no atmosphere containing air in space to scatter sunlight. As there is no scattering of light in space, the scattered light does not reach the eyes and the sky appears dark instead of blue to an astronaut in outer space.

Answer 2

Answer:

Sky appears blue. The molecules of air and other fine particles in the atmosphere have a size smaller than the wavelength of visible light. ... As there is no scattering of light in space, the scattered light does not reach the eyes and the sky appears dark instead of blue to an astronaut in outer space.

Or

Blue light having shortest wavelength is scattered most by the atmospheric particles. Thus, sky appears blue to an observer from the surface of the earth. For an astronaut staying in the international space station orbiting the Earth, the colour of the sky will be black because the light reaching it does not scatter.

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