Spectacular Light Pillars Illuminate Northern China Sky

A stunning display of vertical light columns, known as light pillars, was captured illuminating the night sky over Mohe, China. The remarkable photograph, featured as NASA’s Astronomy Picture of the Day, showcases the atmospheric phenomenon alongside the familiar stars of the Orion constellation. This event occurred during freezing conditions, which allowed ice crystals to form near the ground and reflect the city’s lights upward, creating the dramatic pillars. Mohe is the northernmost city in China.

Key Takeaways:

A rare display of light pillars, not auroras, was photographed in Mohe, China.
The phenomenon is created by ground lights reflecting off ice crystals suspended in very cold air.
The iconic constellation of Orion is clearly visible alongside the man-made pillars in the image.
Such "crystal fog" events require specific freezing temperatures for ice crystals to form near the surface.

Atmospheric Optics Create Vertical Columns of Light

The featured pillars are a type of atmospheric optics typically seen closer to Earth than auroras. They form when flat, fluttering ice crystals act like countless tiny mirrors, reflecting light sources upward. While similar "Sun pillars" can occur at sunrise or sunset, this event was caused by artificial city lights. The crystals must be oriented horizontally to create the columnar effect visible from the ground.

Freezing Mohe Climate Provides Perfect Conditions

The image was taken in Mohe, a city known for its extreme cold, which provided the necessary environment. For ground-level light pillars to occur, temperatures must be low enough for ice crystals to form in the air near the surface without evaporating—a condition sometimes called a "crystal fog." This specific meteorological setup transformed ordinary urban lighting into an extraordinary celestial spectacle against the winter sky.

Event Highlights Accessibility of Sky Phenomena

This occurrence demonstrates that captivating sky events are not limited to remote, dark-sky locations or rare solar storms. Under the right common winter conditions, urban and suburban areas can witness striking visual phenomena. The simultaneous visibility of the natural Orion constellation and the human-influenced light pillars offers a unique juxtaposition of the cosmic and the terrestrial in a single frame.