A giant patch of black, fossilized lava that was spewed across the Sahara desert over millions of years ... This model also selected pixels where patches of sand that have settled in between ...
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Earth from space: Wandering sand dunes circle gigantic 'eye' sculpted by ancient city-killer meteor in the SaharaThis striking astronaut photo shows off an "eye-catching" impact crater in the Sahara Desert. The oculus-like structure is surrounded by migrating sand dunes ... to other ancient impact craters ...
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