Geddes crater

The crater Geddes, named for Irish stained glass and graphic artist Wilhelmina Geddes, has a "complex geological history that appears to have involved both tectonic deformation and volcanism," NASA says. The image at bottom right is from the Mariner 10 mission in 1974-75. The orange hue in the enhanced-color image at top right, captured by Messenger's Wide Angle Camera in October 2008, is suggestive of "explosive volcanism." The image at left was also captured in October 2008, but with the Narrow Angle Camera. Geddes has a diameter of 50 miles. Click here to get up close with Geddes.