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COMETS EARTH JUPITER KUIPER BELT MARS MERCURY METEORITES NEPTUNE OORT CLOUD PLUTO SATURN SOLAR SYSTEM SPACE SUN URANUS VENUS ORDER PRINTS
PHOTO CATEGORIES SCIENCEVIEWS AMERICAN INDIAN AMPHIBIANS BIRDS BUGS FINE ART FOSSILS THE ISLANDS HISTORICAL PHOTOS MAMMALS OTHER PARKS PLANTS RELIGIOUS REPTILES SCIENCEVIEWS PRINTS
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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. |
