Why the darkest night skies are never truly black

Even in the pristine, light-pollution-free environment of the Atacama Desert, the night sky retains a faint glow. This video explores the natural phenomenon of zodiacal light, a subtle celestial display visible above the European Southern Observatory's telescopes.

The zodiacal light is a natural illumination that persists even when human-made light pollution is entirely absent. Astronomers working at the European Southern Observatory in northern Chile frequently observe this phenomenon, which serves as a reminder that the night sky is not perfectly dark.

The video, presented by Dr. Joe Liske, provides an overview of this celestial occurrence. It highlights the unique conditions of the Atacama Desert, where the lack of artificial interference allows for the observation of such subtle astronomical features.

Source: ESOcast 82: Zodiacal Light