That's the southern end of the Milky Way (it's "bulge" is
hidden by the wall :)
Hole in the Wall arch is an obscure arch within the Courthouse Towers section of Arches National Park that is no longer marked on any park maps. The wall it is part of a huge, but very thin sandstone fin that makes this feature very intriguing to me. I have planned this shot for over 20 years. See the photo series below.
See the awe-inspiring NightScape VIDEO – with one Milky Way after another!
My new ebook, Milky Way NightScapes, gives extensive details on how to enhance the landscape foreground. Three other chapters cover planning, scouting, forecasting star/landscape alignment, shooting and post processing.
Canon 5D Mark II camera
LF 24mm f1.4L II lens @f2.0
"Light Painting": 2 gel-covered LED lights within the hole for a warm glow; a diffused 2-million candlepower stationary light, positioned 400 feet to camera left (turned on for 10 of the 15-seconds exposure).
Additional technical stuff
Behind the scenes: The NightScape Story