I don't know why the sky is blue, but I have a few ideas. I know that the oceans are relatively bluish, even though water is naturally clear, because they reflect some of the blue from the sky. I know that the gas giants Neptune and Uranus look blue and/or green because of the concentration of methane in our atmosphere. Our atmosphere is 78% nitrogen, 21% oxygen, and 1% other gasses. It could be possible that the mixture of gasses in the atmosphere creates a light-bluish layer of gas when combined with the lighter, higher-up pressures. Even so, that is probably incorrect, because the clouds on Uranus and Neptune are... clouds. The color of our sky is something different.

The sky could be blue because the oceans are blue. Earlier I said that the oceans reflect the skies, but it could be the other way around. The oceans could be darkened by sediment in the water, or the lighter water could transmit the darkness from the deep. The blue of the oceans could reflect against the particles in the sky and create a canopy of blue. That is also probably incorrect. The different concentration of particles in the sky would create an uneven canopy of blue, with other colors poking through. Also, without like to broadcast the ocean's blue, the 



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