The circular formation in this photo is the Richat Structure of Mauritania, which “has captured the attention of astronauts for about as long as NASA has sent humans into orbit around Earth.” ...

Astronauts aboard the International Space Station captured this image of a huge crater in Africa on Nov. 22, 2014. This is the Richat Structure in northwestern Mauritania, otherwise known as the “Eye ...

This story was updated at 12:54 p.m. EDT. A huge, copper-toned formation in West Africa dominates a mesmerizing photo taken by an astronaut aboard the International Space Station. Dutch astronaut ...

NASA’s Goddard Space Flight Center decided to kick a hornet’s nest July 16 when it shared an image of one of Earth’s most debated oddities. Known as the Richat Structure, the formation is a series of ...