That's some beautiful animation. At first I wondered, "Wouldn't the air be all purple normally?" Turns out my memory of the atmosphere levels were wrong. > By

That's some beautiful animation. At first I wondered, "Wouldn't the air be all purple normally?" Turns out my memory of the atmosphere levels were wrong. > By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.