PIA02072: Indications of Subsurface Ice: Polygons on the Northern Plains
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  1024 x 812 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-150
 Addition Date:  2000-06-01
 Primary Data Set:  MGS EDRs
 Full-Res TIFF:  PIA02072.tif (867.6 kB)
 Full-Res JPEG:  PIA02072.jpg (236.7 kB)

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Original Caption Released with Image:

Someone's kitchen floor? A stone patio?This picture actually does show a floor--the floor of an old impact crater on the northern plains of Mars. Each "tile" is somewhat larger than a football field. Polygonal patterns are familiar to Mars geologists because they are also common in arctic and antarctic environments on Earth. Typically, such polygons result from the stresses induced in frozen ground by the freeze-thaw cycles of subsurface ice. This picture was taken by MOC in May 1999 and is illuminated from the lower left.

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