Ever wonder why the sky was blue?
The light we get from the sun is (one) diffused everywhere, so what able to strain through the atmosphere and hit our eyes is blue. and since our planet's spherical, sunlight is distributied differently, so in other parts of the world see red.
What's diffusion caused by? the oxygen and nitrogen in the air. if it was water, it would be hazy and weird everywhere... i wonder what clouds would be like...?