![](http://www.alamy.com/thumbs/6/09912331-D54F-4187-9A2F-9D018E7F6986/2HNB903.jpg)
Polar stratospheric clouds (PSCs) on evening sky.
Size: 4862px × 3643px
Photo credit: © Johannes Hansen / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: air, atmosphere, backlight, beautiful, beauty, black, blue, cloud, clouds, cloudscape, color, colourful, dark, day, forest, heaven, meteorology, nature, pine, silhouette, sky, stratospheric, tree, variety, vibrant, weather