A phenomenon known as 'light pillars' illuminated the night sky above Graceville, Minnesota, and put on a spectacular show early Thursday morning.
There have been plenty of sun pillars reported, too.They can occur at sunrise or sunset when the sunlight passes through a layer of flat ice crystals in the clouds.and they're all facing horizontally at different heights," Kavulich said. "So just a tiny little image of the sun is being reflected off of each one of these tiny mirrors, and it ends up forming this horizontal column that we call a pillar.
, pillars from artificial light can stretch taller than natural light pillars because the "rays from the lights are not parallel and plate crystals with small tilts can still reflect downwards." The crystals have to be about halfway between you and the light source for the pillar to form. The Optics site says if it's a freezing night and ice crystals surround you, even lights nearby, like streetlights, can give off pillars.
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