The circular formation, highlighted by the space agency’s Earth Observatory, features rings made of sedimentary and igneous ...
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 ...
In the middle of Mauritania's Sahara Desert, surrounded by an ocean of sand, lies a colossal stone spiral that seems almost too perfect to be natural. From orbit, in a recent image taken by the ...
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