Photos: Northern lights glow over the Midwest

Northern lights
The northern lights as seen from Grand Portage, Minn. on Monday, Sept. 26, 2011. The northern lights, also known as aurora borealis, are a luminous glow of the upper atmosphere which is caused by energetic particles that enter the atmosphere from above, according to the University of Alaska-Fairbanks.
Photo courtesy Travis Novitsky
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