Image description: A Sun Dog in Denali National Park in Alaska.

A Sun Dog is a ring of light that is sometimes visible around the sun when light is refracted through ice crystals.

Photo from the National Park Service

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From the Department of Interior:

In the shadow of 13,063-foot Wheeler Peak, 5,000 year old bristlecone pine trees grow on rocky glacial moraines. Come to Great Basin National Park to experience the solitude of the desert, the smell of sagebrush after a thunderstorm, the darkest of night skies, and the beauty of Lehman Caves. Far from a wasteland, the Great Basin is a diverse region that awaits your discovery.

Photo: Ken Koenig, NPS

Image description: A full moon rises over Mt. Everts in Yellowstone National Park.

Photo by the Yellowstone National Park Service.

Image description: The moon rises over Mt. Everts in Yellowstone National Park.

Photo by Jim Peaco