The Aurora Borealis appears in the night sky outside of Eielson Air Force Base, Alaska, Oct. 10, 2018. The northern lights have been active while Eielson AFB has hosted more than 20 visiting units during Red Flag-Alaska 19-1. The Pacific Air Forces commander-directed field training exercise is scheduled to last until Oct. 19.

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Photo credit: © David Wa / Alamy / Afripics
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