FILE - The aurora borealis, or northern lights, fill the sky above the Takotna, Alaska checkpoint during the Iditarod Trail Sled Dog Race on Wednesday, March 9, 2011. (AP Photo/The Anchorage Daily News, Bob Hallinen, File)

Associated Press
FILE - The aurora borealis, or northern lights, fill the sky above the Takotna, Alaska  checkpoint during the Iditarod Trail Sled Dog Race on Wednesday, March 9, 2011.   (AP Photo/The Anchorage Daily News, Bob Hallinen, File)
FILE - The aurora borealis, or northern lights, fill the sky above the Takotna, Alaska checkpoint during the Iditarod Trail Sled Dog Race on Wednesday, March 9, 2011. (AP Photo/The Anchorage Daily News, Bob Hallinen, File)
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