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1)Why does the sky appear dark instead of blue to an astronaut?

When sunlight passes through the atmosphere,the fine particles in air scatter the blue colour (shorter wavelength) more strongly than red.The scattered blue light enters our eyes.If the earth had no atmosphere there would not have been any scattering and the sky would have looked dark.This is why the sky appears dark to passengers flying at very high altitudes or to an astronaut.


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