13900394 - Orion and the stars of the winter sky trailing as they set behind and through Turret Arch, in Arches National Park, Utah. I shot this April 6, 2015 after twilight but before the waning Moon rose, so the sky was dark. Illumination is from stars and the sky – no artificial light provided, and the Moon was not up.13897842 - The summer Milky Way over the sandstone formations at Writing-on-Stone Provincial Park in southern Alberta, on a dark of the Moon night, July 31, 2016. The foreground is iluminated only by starlight. No artificial light painting was employed here. The Lagoon Nebula and objects in Sagittarius and Scutum are to the south here at centre.13900125 - A photographer using a bright light to illuminate Double Arch in Arches National Park, Utah, on a dark night before moonrise provided natural illumination. Using bright lights to paint landscapes at night is common but often produces an artificial style of illumination.13897964 - The 2016 Perseid meteor shower, in a view looking north to the Big Dipper and with the radiant point in Perseus at upper right, the point where the meteors appear to be streaking from. I shot this on the peak night of the shower, August 11/12 after moonset so the sky was dark and in fact filled with bright airglow, appearing here as bands of green and yellow, mixed with a low-level aurora to the north as well. While it looks like the sky has artificial light pollution, the glows here are natural, from aurora and airglow.
