In 1873 explorer and pioneer William Butler travelling across the then unsettled Canadian Prairies wrote, “No solitude can equal the loneliness of a night-shadowed prairie.” This is the Milky Way and night sky on a perfectly clear night, July 25, 2017, on the Canadian Prairies at Writing-on-Stone Provincial Park in Alberta, near the border looking south to the Sweetgrass Hills (West Butte) of Montana. The Milk River, which flows into the Missouri River, winds below. The site is sacred to the Blackoot First Nations. The wooden buildings below are replicas of the late 1800s North West Mounted Police outpost in Police Coulee. Sagittarius and Scorpius are on the southern horizon, and Saturn is the bright object in the Dark Horse right of centre. The galactic centre is amid the bright star clouds above the horizon. The sky at left is green with natural airglow. The ground is illuminated only by starlight and airglow. This is a composite of a stack of 8 untracked exposures for the ground (mean combined to smooth noise) and 4 tracked exposures for the sky taken immediately afterwards, and again mean combined to smooth noise. All are 2 minutes at f/2 with the 20mm Sigma Art lens, and Nikon D750 at ISO 1600. The tracker was the Star Adventurer Mini.
The “river of stars” – the Milky Way – arching over the scenic bend of the Red Deer River, Alberta, from the Orkney Viewpoint overlooking the Badlands and river valley, in a 270° panorama. To the north at left, a weak aurora shines along the horizon. Bands of airglow also colour the sky to the east at centre, and perpetual twilight lights the sky at far left. To the south at right, the Milky Way becomes lost amid the light pollution from Drumheller, Alberta, made more obvious by some clouds drifting through. So this is a study in skyglows: aurora, twilight, airglow, Milky Way and urban skyglow, and of the contrast between the natural sky and light polluted sky. And of course, I like the way the curve of the Milky Way is mirrored in the curve of the river, which is why I picked this spot and this night in spring, when the Milky Way is still arching across the east and not overhead as it is later in summer. The most prominent stars reflected in the still waters of the rive are the stars of Delphinus the Dolphin, but there are no dolphins in this river! Only ones made of stars. This is a stitch of 8 segments with the Sigma 20mm Art lens, in portrait mode, and Nikon D750. Each 30 seconds at f/2 and ISO 3200. Stitched with Adobe Camera Raw. Taken on a mild and moonless night, May 20, 2017.
The lone curtain of purple and blue aurora appears briefly amid a broader band of green aurora over the sweeping Red Deer River and Badlands of southern Alberta. From Orkney Viewpoint looking north over the valley. The Bleriot Ferry crossing is in the distance at the lights. Cassiopeia is just above the purple curtain. The river reflects the aurora light. This is a stack of 84 x 15-second exposures for the ground to smooth noise, and one 15-second exposure for the sky, all with the 20mm Sigma lens at f/2.8 and Nikon D750 at ISO 3200. They were part of a 250-frame time-lapse.
