What makes the sky blue?

The sky is blue due to a phenomenon called Raleigh scattering. This scattering refers to the scattering of electromagnetic radiation (of which light is a form) by particles of a much smaller wavelength. ... These shorter wavelengths correspond to blue hues, hence why when we look at the sky, we see it as blue

sky isn't blue, we see the sky in blue because of the scattering of blue light that falls in our eyes

see below  

explanation:

all of the above