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This drawing illustrates that the newest Mars orbiter will be double the size of the satellites currently in operation around the Red Planet. MRO is the Mars Reconnaissance Orbiter and MGS is the Mars Global Surveyor.
The Mars Reconnaissance Orbiter will study the surface of Mars for water, including this meteor impact crater in Newton Basin where frost can be seen on the walls and sand dunes on the floor.
The Chasma Boreale is a trough in the north polar cap area. The spring photo shows dark sand emerging from bright frost from the winter.