Aurora

Photo: Tony Bojkovski
Photo: Chris Brown
Photo: Jeremy Wills
Photo: C. Wilson

Noctilucent clouds

Photo: John French
Photo: John French
Photo: Glenn Browning
Photo: Ashleigh Wilson
Photo: Gary Miller

Polar stratospheric clouds

Photo: Justin Chambers
Photo: Justin Chambers
Photo: Glenn Browning
Photo: Simon Alexander
Photo: Barrend (Barry) Becker
Photo: Glenn Browning
Photo: Justin Chambers
Photo: Justin Chambers
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