Sergey Gorshkov / Aurora borealis over valley, Putorana Plateau, Siberia, Russia

Matthias Breiter / Aurora borealis above taiga, Whitehorse, Yukon Territory, Canada

Matthias Breiter / Aurora borealis above taiga, Whitehorse, Yukon Territory, Canada

Matthias Breiter / Aurora borealis above coast, Hudson Bay, Manitoba, Canada

Orsolya Haarberg / View of a rainbow in the spray of Bjornefossen Waterfall, Saltfjellet-Svartisen National Park, Norway, August 2015.

Espen Bergersen / Northern lights / Aurora borealis over the Otertind peaks, Troms, Norway, October 2014.

Staffan Widstrand / King eider duck (Somateria spectabilis) male, Batsfjord village harbour, Varanger Peninsula, Norway.

Hiroya Minakuchi / Northern lights, Lofoten Islands, Norway

Hiroya Minakuchi / Northern lights, Lofoten Islands, Norway

Espen Bergersen / Two Svalbard reindeer (Rangifer tarandus platyrhychus) Svalbard, Norway, April.

Uri Golman / Svalbard reindeer (Rangifer tarandus platyrhynchus) in velvet, resting, Svalbard, Norway, August.

Sven Zacek / Cross-country skiier on a moonlit night admiring the Northern Lights (Aurora borealis), Norway, March 2013.