Stefan Christmann / Landscape of Emperor penguin (Aptenodytes forsteri) habitat with sun halo, Atka Bay, Queen Maud Land, Antarctica. October
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Mark MacEwen / Firefly squid (Watasenia scintillans) close to beach during mating season. Toyama Bay, Japan.
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Mark MacEwen / Japanese firefly (Luciola cruciata) light trails at night above stream in rural Japan. June.
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Steven Kazlowski / Photographer in front of Northern lights / Aurora borealis glowing brightly over the frozen eastern Beaufort Sea, Arctic National Wildlife Refuge, Alaska Model released.
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Floris van Breugel / Aurora borealis / Northern Lights seen from entrance to tent, Brooks Range, Gates of the Arctic National Park, Alaska, USA, September 2014.
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Floris van Breugel / Aurora Borealis over yellow tent lit from within and mountainous scenery, Arrigetch Peaks, Gates of the Arctic National Park, Brooks Range, Alaska, USA, August 2014.
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Bryan and Cherry Alexander / Sundogs (parhelia / parhelai) behind a 'Christmas tree' (valve assembly) in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.
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Mark Taylor / Sliding Stone or Moving Rock of Racetrack Playa, Death Valley, California, USA
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Inaki Relanzon / Volcanic eruption, Eyjafjallajokull, near the Myrdalsjokull glacier, South Iceland, april 2010.
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Inaki Relanzon / Volcanic eruption, Eyjafjallajokull, near the Myrdalsjokull glacier, South Iceland, april 2010.
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Aflo / Y-10805 Forked lightning racing across sky at night
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Aflo / Y-11106 Double rainbow over sea with waves breaking on shoreline