Mars Photography By Mars Reconnaissance Orbiter

• Avalanches
The Mars Reconnaissance Orbiter CTX and HiRISE cameras have photographed a number of avalanches off the scarps of the northern polar cap as they were occurring.
• Flowing salty water
On August 4, 2011 (sol 2125), NASA announced that MRO detected what appears to be flowing salty water on the surface or subsurface of Mars.