Natural Skyglow

From the photographer: “What are the main causes that don’t let the night sky to get really dark? Even if there would be no light pollution, there is still natural causes that don’t let the night sky appears so dark: Bright band of our home galaxy (Milky way), Airglow, Shiny planets and Gegenschein. All these four natural skyglow sources appear in the picture above. Taken in a really dark place in the middle of Iran central desert. “