Aurora Borealis on November 8, 2004, Langhus, Norway.
Glowing modulations of light form a variety of rays, arcs, and curtains. Each ray lines up along the direction of Earth’s magnetic field as excited molecules in Earth’s upper atmosphere collide and release their energy in the form of visible light. Green and red hues are produced by excited oxygen, while blue auroras are produced by nitrogen in the earth’s atmosphere.
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