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Tuesday, October 28, 2008

Mysterious Giant Circle in the Sahara Desert

The Richat Structure, a prominent circular feature in the Sahara desert of Mauritania near Ouadane, has attracted attention since the earliest space missions because it forms a conspicuous bull's-eye in the otherwise rather featureless expanse of the desert. It has a diameter of almost 30 miles and has become a landmark for space shuttle crews.