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Alaskan green The skies over the frozen Susitna River near Talkeetna, Alaska, are lit up by a display of the northern lights on Jan. 23, 2012. The aurora was          enhanced by solar flares in the days preceding the event.

 Alaskan green

The skies over the frozen Susitna River near Talkeetna, Alaska, are lit up by a display of the northern lights on Jan. 23, 2012. The aurora was          enhanced by solar flares in the days preceding the event.