The snow leopard

The snow leopard

. Strange, beautiful dark spots were created when frost was evaporating from the south polar dunes on Mars. The spots are areas where dark sand has been exposed from beneath bright frost as the south polar cap begins to sublimate and retreat. This image was taken from the Mars Global Surveyor on 1 July 1999. It is about 1.2 kilometers wide, and located at 61.5 degrees south and 18.9 degrees west. (Courtesy of NASA, JPL and Malin Space Science Systems.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University