northern lights (aroura borealis)

Scientists expose mystery behind northern lights
In this Sept. 3, 2006 file photo, a spectator watches the aurora borealis rise above the Alaska Range, in Denali National Park, Alaska. On Thursday, July 24, 2008, NASA released findings that indicate magnetic explosions about one-third of the way to the moon cause the northern lights, or aurora borealis, to burst in spectacular shapes and colors, and dance across the sky. (AP Photo/M. Scott Moon, File)