Mars: Northern plains PIA02073
The northern plains of Mars exhibit craters that often appear to be partly buried by or exhumed from beneath layers of pitted and eroded material.
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Image Credit: NASA/JPL/Malin Space Science System  

The northern plains of Mars exhibit craters that often appear to be partly buried by or exhumed from beneath layers of pitted and eroded material. Each day, Mars Global Surveyor makes 12 orbits around the red planet. On each orbit at the present time (April 1999), the spacecraft passes from daylight into night somewhere over the northern plains of Mars, and re-emerges into daylight over the southern cratered highlands. The illumination conditions near the martian terminator--the line between night and day--are perfect for observing surface texture and topography. This picture shows a common, rough and bumpy texture that MOC has revealed on the northern plains of Mars.  
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