Colors of an aurora depend not only on which element is emitting light, but also on *where* it is.
Oxygen at high altitudes glows red; at lower altitudes it glows green. Purple nitrogen is lower still.
Atoms are complicated creatures!
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Colors of an aurora depend not only on which element is emitting light, but also on *where* it is. Oxygen at high altitudes glows red; at lower altitudes it glows green. Purple nitrogen is lower still. Atoms are complicated creatures! No comments
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