Ah! Cruising at 40,000 feet in a Jet Blue Passenger airplane! Looking into the wonderful blue sky! But why is it blue? Why not green? The molecules in the air scatter blue light from the sun more than red light from the sun. When the sun goes down, more red and orange light is being emitted. The Blue light is scattered out of our sight which lets us only see the beautiful sunset. You can in fact, see how the blue gets darker and darker as we go up!
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