© National Weather Service - Las Vegas
An impressive sun halo appeared in the sky
over Las Vegas on Monday morning thanks to the presence of a thin layer of high-altitude cirrus clouds.
Halos are rings of light that can encircle the sun or the moon, and they usually occur when cirrus clouds are covering the sky.
A mix of chemistry, physics and geometry are the main components for sun halos.
The atmosphere consists of a mix of gases, including oxygen, nitrogen and water vapor. At high altitudes in the sky, water vapor condenses and then freezes into ice crystals. As sunlight passes through those ice crystals, the geometry of the crystals causes sunlight to refract, or bend, similar to what happens when light passes through a prism.