Spectacular Martian dunes snapped by Mars satellite

The Martian desert teems with geologic wonder. Aboard NASA's far-off satellite, the Mars Reconnaissance Orbiter, a powerful camera recently captured a brilliant image of sand dunes inside a Martian crater. NASA took the image from 160 miles above the red desert, in the Tyrrhena Terra region on Mars, located in the planet's southern hemisphere. These are a curious type of dune, dubbed "star dunes." They're often formed inside craters when wind blows from different directions, ultimately creating ...