NASA's Mars Global Surveyor shows gullies formed in the wall of a south middle-latitude crater wall on Mars. The banked, curved nature of the channels in each gully are among the key indicators that a fluid may have been required to form them.

10 August 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image, acquired in March 2004, shows gullies formed in the wall of a south middle-latitude crater wall near 39.7°S, 208.6°W. The banked, curved nature of the channels in each gully are among the key indicators that a fluid, such as liquid water, may have been required to form them. The picture covers an area about 3 km (1.9 mi) across and is illuminated by sunlight from the upper left.

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