What colour does the sky appear to an astronaut?

Which of the two is scattered more easily: light of shorter wavelengths or light of longer wavelengths?

State whether the following statements are true or false:

(a) The scattering away of red light makes the sky appear blue during the day time.

(b) The scattering away of blue light makes the sun appear red at sunset.

Which effect is illustrated by the observation that when a beam of sunlight enters a dusty room, then its path becomes visible to us.

State two effects produced by the scattering of light by the atmosphere.