In a neon tube, light is produced by a similar mechanism. The tube contains a low-pressure gas that is under high voltage. The high voltage ionizes the gas, and when the electrons recombine, they emit light. The color of the light depends upon the type of gas that is ionized: Oxygen emits bluish light, and neon emits reddish light. Because the chemical makeup of the Earth's atmosphere changes with altitude, the color of the aurora depends on altitude. The most spectacular auroras occur at elevations of 75 to 150 kilometers, and can produce red, green, yellow, blue and violet light. The shimmering is due to motion of the ionized gas as it is pulled by the Earth's magnetic field. And what is our planetary sign saying? Come and see and learn!
'A theory with mathematical beauty is more likely to be correct than an ugly one that fits some experimental data. God is a mathematician of a very high order, and He used very advanced mathematics in constructing the universe.'