NASA's Mars Global Surveyor shows a rare patch of dark sand dunes in the Nilosyrtis Mensae region of Mars.

31 July 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a rare patch of dark sand dunes in the Nilosyrtis Mensae region of Mars. The steepest slopes on these dunes, their slipfaces, point toward the south-southwest, indicating that the dominant winds that formed them came from the north-northeast (top/upper right).

Location near: 34.5°N, 295.1°W
Image width: width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Northern Autumn

View all Images