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epa04667088 Northern Lights observed in the night sky on a country road near Lietzen in Maerkisch-Oderland, Germany, 17 March 2015. The Northern Lights (Aurora borealis) were generated by a gigantic cloud of electrically charged particles of solar storm in the Earth's atmosphere. The color effect is strengthened somewhat by the digital camera on a long exposure of about 20 seconds. EPA/PATRICK PLEUL