11.6.2" Why is the colour of the clear Sky Blue? "

Why does the colour of the sky appear blue?

Stars appear to be twinkling but planets do not twinkle. Why? Explain why the colour of the clear sky during day appears blue and during sunset appears red.

If plant is called 'green'. 'green' is called flowert. tower bacalled blue, blue' is called white ad white' is called blnck", then what is the colour of the clear sky?