Titan has sand dunes covering about 17 per cent of its surface ... by direct impacts of meteorites and comets on Titan. “This model might be crazy, but it is testable,” said Bottke.

This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

The model, generated by ABC News using hundreds ... in the 70s found it took the dunes six years to regain the lost sand. "Dunes are not just a pile of sand, they're actually complex systems ...

On the Atlantic coast of southwestern France, Dune du Pilat is a breathtaking natural wonder. Rising to an incredible 360 feet, it is Europe’s tallest sand dune, dwarfing even the famous Leaning ...