In this picture made available Monday, February 24, 2014, polar lights shine in the sky above Guelper Havel river in Guelpe, northwest of Berlin, Germany. These northern lights are caused by a giant cloud of electric particles of a sun storm in the Earth's atmosphere. Guelpe in nature park Westhavelland is said to be Germany's darkest place. (Photo by Patrick Pleul/AP Photo/DPA)
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