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What is the main cause of an aurora

What is the main cause of an aurora-example-1
User Omri L
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Bottom line: When charged particles from the sun strike atoms in Earth's atmosphere, they causeelectrons in the atoms to move to a higher-energy state. When the electrons drop back to a lower energy state, they release a photon: light. This process creates the beautiful aurora, or northern lights.
User Wheezil
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