Taller than the tallest communications tower, taller than the highest mountain, beyond the plane that flies higher, is the kingdom of the auroras.
The auroras do not usually happen below 60 kilometers, and can reach up to 1,000 kilometers of altitude. The light of an aurora is due to energized electrons and protons that collide with the molecules of the Earth's atmosphere.
When viewed from space, a complete aurora usually has the appearance of a circle around one of the Earth's magnetic poles. In the photograph we see the crown of a peculiar purple aurora, which occurred on August 30, 2004 over Harstad, Norway.
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