A reworked version of my original image where I took out the early frames contaminated with airline traffic.
Date: January 29, 2009
Location: Death Valley National Park, CA
Optics: Canon EF 17-40mm f/4L USM used at 17mm
Camera: Canon 20Da on Tripod
Exposures: 68 JPEG light frames of 1 minute at ISO 1600
Process: Multiple images stacked with Photoshop.