Earth's Richat Structure

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Image Credit: NASA/GSFC/METI/Japan Space Systems, and U.S./Japan ASTER Science Team

Image Credit: NASA/GSFC/METI/Japan Space Systems, and U.S./Japan ASTER Science Team

What on Earth is that? The Richat Structure in the Sahara Desert of Mauritania is easily visible from space because it is nearly 50 kilometers across. Once thought to be an impact crater, theRichat Structure’s flat middle and lack of shock-altered rock indicates otherwise.

 

 

Dizzying view: World Trade Center spire installed

 
 

Hold onto your lunch! Watch construction workers complete the tower. The topmost section was lofted into place with an attached camera rolling. Topping out at 1776 feet, it was the 3rd tallest building in the world at the time of completion.