Blue.
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The sky is transparent. It's blue to gray during the day because of Rayleigh and/or Mie scattering of sunlight by the molecues and atoms of the atmosphere and clouds.
http://hyperphysics.phy-astr.gsu.edu/hba…
http://www.sciencemadesimple.com/sky_blu…
http://hyperphysics.phy-astr.gsu.edu/hba…
http://www.sciencemadesimple.com/sky_blu…
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Clear, we only see blue because as light bends in the sun it reflects onto are water which covers 70% of the earth, same reason mars sky is red because the whole planet is red
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blue at day time, black at night time, and reddish during sunset. its all because of reyleigh scattering
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cerulean
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from our eyes it looks blue, but it is clear.
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I think it's blue