Mars

Evidence for water on the Martian Surface:

Close up section of the previous image:

Gullies on a crater wall:

Wide angle view of the Martian "Grand Canyon", Vallis Marineris:

Enlargement of white rectangle showing evidence of possible sedimentary layering:

Gullies from possible seeping groundwater emanate from the tops of trough walls:

Compare features produced by water erosion on Earth (right) with similar Martian features (left):

A wide-angle view of the valley Nirgal Vallis:

Magnified view of white rectangle showing small gullies on the valley walls:

Wide angle view of pitted plains:

Magnified view of white rectangle showing gullies in the pit walls:

Wide-angle view of Martian troughs:

Magnified view of white rectangle shows gullies on the trough walls:

The Schiaparelli Basin as imaged by Mars Global Surveyor on June 3, 2003 shows layered formations within an old impact crater.