The Big Dipper above the Blue Star Spring in Yellowstone National Park. The night sky in Yellowstone is beautiful, with very low light pollution. Blue Star Spring is a pretty blue pool just behind Old Faithful.

Date and place: August 24, 2017; Yellowstone National Park, Wyoming, USA

Camera: Canon EOS 6D

Lens: Sigma 24mm f/1.4 Art

Exposure: 15s

Aperture: f/1.8

ISO: 3200