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http://mars.jpl.nasa.gov/mgs/msss/camera/images/polar_montage_2000 Mars Global Surveyor is a Mars orbiter with a high-resolution Mars Orbiter Camera which has photographed the south polar cap where the layered terrains of Mars are among the most exotic extraterrestrial astrogeological features. The photos displayed include the layered terrains of the polar regions of Mars which are among the most exotic planetary landscapes in our Solar System. The layers exposed in the south polar residual cap are thought to contain detailed records of the Martian climate over the last 100 million years or so. The materials that comprise the south polar layers may include frozen carbon dioxide, water ice, and fine dust. Pictures show complex erosional patterns that have developed on the south polar cap, perhaps by a combination of sublimation, wind erosion, and ground-collapse.
http://alpo-astronomy.org ALPO is an educational organization that instructs observers in proper technique, collects amateur observations and promulgates them to the professional community.
http://www.aapg.org/committees/astrogeology Astrogeology Committee discusses astrogeology and asteroids.
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