Mars Polygons
Mars Location This image shows polygonal patterned ground in the Martian southern hemisphere. The existence of polygons on Mars may indicate regions where water ice lies within a few meters of the surface. (Mars Global Surveyor, Mars Orbiter Camera image; NASA/JPL/Malin Space Science Systems)
Earth Polygons
Earth Analog Polygonal patterned ground is common on the floor of Antarctica's Beacon Valley and indicates the presence of liquid water in the shallow active layer of permafrost. (Image credit: John W. Holt, Institute for Geophysics, University of Texas)

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