Photo: Timo Newton-Syms/Flickr
Thin, colorful ice pillars appear in the night sky above Ruka, Finland.
This stunning visual phenomenon occurs when light reflects off horizontally-faced ice crystals hovering in the air. The pillars, which are often mistaken for UFO sightings, are produced by sunlight, moonlight or artificial manmade light situated along the horizon.
Photo: Eric Magnuson/Flickr
Photo: Jasper Nance/Flickr
Photo: Christoph Geisler/Wikimedia
Photo: Nat Wilson/Flickr
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