Question

What will be the colour of sky as seen from the earthin the absence of atmosphere?

Answer 1

The colour of the  sky in the absence of the atmosphere will be blacksince there is no scattering of light(VIBGYOR).

Answer 2

(a) In the absence of any atmosphere, there will be no scattering of sunlight and the sky will appear dark.

(b) In the visible spectrum, the red colour has the largest wavelength. The red colour is least scattered by fog or dust particles. Therefore, we can observe red colour easily even in foggy and dusty conditions.