On the ground, its rings are hard to appreciate; dunes, heat haze, and uneven terrain all conspire to hide the full shape. But from space, especially in the images taken by the Copernicus satellite, ...

The Eye of the Sahara looks almost designed for satellite cameras, a perfect bullseye of rock and sand stamped into the ...

From an altitude of 255 miles, an Expedition 59 crewmember photographed the Richat Structure, or the “Eye of the Sahara,” in northwestern Mauritania. The circular geologic feature is thought to be ...

Orbital emphysema is where air collects within the eyelid or orbit, the space within the skull that contains the eyeball. This may increase pressure within the eye and result in vision loss. The ...