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PHOTO INDEX OF PRIMARY TARGETS ASTEROIDS COMETS EARTH JUPITER KUIPER BELT MARS MERCURY METEORITES NEPTUNE OORT CLOUD PLUTO SATURN SOLAR SYSTEM SPACE SUN URANUS VENUS ORDER PRINTS OTHER PHOTO INDEXES ALL TARGETS PHOTO CATEGORIES SCIENCEVIEWS AMPHIBIANS BIRDS BUGS FINE ART FOSSILS INDIAN ISLANDS MAMMALS OTHER PARKS PLANTS RELIGIOUS REPTILES ROCKS & MINERALS SCIENCEVIEWS PRINTS

Mars: Polygons Target Name:   Mars Spacecraft:   Mars Global Surveyor Produced by:   Malin Space Science Systems/NASA Copyright:  Public Domain Date Released:  19 July 1999 Related Document Martian Canyons, Valleys, and Channels Download Options Name Type Width x Height Size polygons.jpg JPEG 640 x 508 75K polygons.jpg JPEG 1024 x 812 196K polygons.tif TIFF 1024 x 812 871K Some impact craters on the northern plains of Mars exhibit polygonal patterns on their floors. Similar features are common in arctic and antarctic environments on Earth, and usually indicate the presence and freeze-thaw cycles of subsurface ice. This picture was taken by MOC on May 6, 1999.

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