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Earth from space: Wandering sand dunes circle gigantic 'eye' sculpted by ancient city-killer meteor in the Sahara

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78% Informative

The Aorounga structure is a 7.8-mile -wide ( 12.6 kilometers ) impact crater located in the southeast Sahara in northern Chad .

The oculus-like structure is surrounded by migrating sand dunes that are capable of traveling more than 100 feet ( 30 meters ) every year .

Experts believe that the structure formed around 345 million years ago and was likely created by a meteor around 2,000 feet ( 600 m) across.