CBSE Class 10 Answered

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 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 .