Frozen desert

Frozen desert

. The rough, grooved surfaces of these dunes, found in the Herschel Basin, indicates that the sand is cemented into place. Winds had to scour the surface to remove material. The Herschel basin is named after the British astronomers, William H. Hershel (1738-1822) and his son John F. Hershel (1792-1871). This image was taken from the Mars Global Surveyor on 5 May 1999. It is about 1.2 kilometers wide and centered near 15 degrees south and 228 degrees west. (Courtesy of NASA, JPL and Malin Space Science Systems.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University