Question

if there is no sun then the color of sky is?

Answer 1

Heya friend!!
Rajdeep here...

The white light rays come from Sun, and white light comprises seven colours (Violet, Indigo, Blue, Green, Yellow, Orange, Red). Since blue light has the least wavelength, it scatters all around and the sky appears BLUE.

Now, if the sun is not there, there will be no white light rays, hence no blue rays to scatter...so colour of the sky will be BLACK.
Just note the colour of sky at night...it is BLACK..

Thanks...