The northern lights fill the sky over the south shore of Lake Superior east of Superior, Wis. above Duluth, Minn., early Sunday, July 15, 2012. A solar storm sparked the spectacular northern lights ... more 
The northern lights fill the sky over the south shore of Lake Superior east of Superior, Wis. above Duluth, Minn., early Sunday, July 15, 2012. A solar storm sparked the spectacular northern lights display in the skies over the Upper Midwest. (AP Photo/The Duluth News-Tribune, Andrew Krueger) less 
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Associated Press
Mon, Jul 16, 2012 10:00 PM EDT