Oh man, Oman: weird sand dunes seen from space:
The Ar Rub’ al Khali, also called the “Empty Quarter,” is a large region of sand dunes and interdune flats known as a sand sea or erg. This astronaut photograph highlights a part of the Ar Rub’ al Khali near its southeastern margin, in the Sultanate of Oman. Large, linear reddish-brown sand dunes alternate with interdune salt flats, or sabkhas. The orientation of the linear dunes lies at a right angle to northwesterly trade winds that originate in Iraq, known as the Shamal winds. Secondary barchan (crescent-shaped) dunes and star dunes—with crests originating from a single point and stretching in several directions—can form atop the linear dunes when southwesterly winds blow during the monsoon season (Kharif winds). The long, linear dunes begin to break up into isolated large star dunes to the northeast and east (image right). This is likely the result of wind pattern inte...