Sky Color Defines by Airglow

Did you ever wonder what is the real color of the night sky?
From the photographer: “Actually it can be anything, but black. The main reason for that is so called airglow – a faint emission of light by a Earth’s atmosphere (Read on Atmospheric Optics). To show you how bright can it be, here is one of my images of incredibly intense airglow in front of setting Milky Way over the Pacific ocean. Note how dim is the Milky Way behind airglow red emission. Clouds from beneath just add some surrealism to the scene.”