Effects/Phenomena

Light pillars are optical phenomena where artificial lights appear to form vertical shafts above each source of light.  They're caused b...

The Bootleg Fire in Oregon has spawned tornadoes and has generated plumes of smoke that rise to the altitude of jet aircraft flightpaths.  I...

The term civil twilight refers to the period between the time when the sun goes down and when the natural illumination is so dim that artif...

Polar stratospheric clouds appear high in the sky in the polar regions in winter.    Photos in Iceland. Photos by @ h0rdur c/o Fabulous Weir...

On Mars, the colors of the sunset are reversed from what we're used to seeing on Earth.  Sunset at Gusev Crater: The Sun sinks below the...

Heiligenschein , is an optical effect where a bright spot appears to surround the cast shadow of the head of the observer. The glowing spot ...