(in cooperation with AstroPilot.info)
Photograph Explanation:

Noctilucent Clouds. This image was taken 4 July 2004 while airborne at 35,000 feet. From this position near Churchill on Hudson Bay in central Canada (near 59N, 092W) the view was spectacular with many contrasting patterns and fish-bone details visible right overhead. An incredible sight! Photo: BrianWhittaker (.com) as seen on www.SpaceClouds.info.