Amplify’d from www.todayifoundout.com
Simply put, these lights are caused by very fast moving electrons striking atoms in the Earth’s upper atmosphere, primarily oxygen and nitrogen atoms which make up most of our atmosphere. When this happens, it can put these atoms in an excited state. During the process with which they return to their normal state, they emit this excess energy in the form of visible photons.
See this Amp at http://amplify.com/u/hrct
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