Colourful light pillars often appear in winter when snow or ice crystals reflect light from a strong source like the sun or moon. Aided by extreme cold, light pillars appear when light bounces off the surface of flat ice crystals floating relatively close to the ground.
Even NASA cannot explain it. It’s best to gaze in wonder at the sliding rocks on this dry lake bed in Death Valley National Park. Racetrack Playa is almost completely flat, 2.5 miles from north to south and 1.25 miles from east to west, and covered with cracked mud. The rocks, some weighing hundreds of pounds, slide across the sediment, leaving furrows in their wakes, but no one has actually witnessed it.