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Aurora Borealis over Alaska

Summary by friendsofnasa.org
Aurora Borealis over AlaskaAstrophotographer Robert Trejo: "A bright and active night. I live in the mountains and usually covered in clouds. Finally got to view some beautiful, active aurora."On Earth, auroras are mainly created by particles originally emitted by the Sun in the form of solar wind. When this stream of electrically charged particles gets close to our planet, it interacts with the magnetic field, which acts as a gigantic shield. W…
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