5sept03_notes - Water on Mars Geological Evidence for Water...

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5 Sept 2003 Solar System - C.C.Lang 1 Water on Mars Geological Evidence for Water on Mars** - gullies, erosion channels - layers/sedimentary features The Physics of Water on Mars polar ice caps – seasonal variation atmosphere - history Chemical Evidence for Water on Mars Theories for Water on Mars – debates! The Martian Meteorites
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5 Sept 2003 Solar System - C.C.Lang 2 Water on Mars although many images suggest SIGNS of water, NO LIQUID WATER or RAIN has ever been observed! Viking 1 Orbiter MGS One of the most natural human curiosities – related to the ultimate question of LIFE on Mars
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5 Sept 2003 Solar System - C.C.Lang 3 Geological Evidence: Outflow Channels Outflow channels suggest that massive floods happened: - water discharge rates ~10,000 times Mississippi River flood - did these floods form into a massive ocean? Ares Valles MGS data
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5 Sept 2003 Solar System - C.C.Lang 4 Geological Evidence: Martian Channels Martian Gullies: left (Mars) and right (Earth). In the Earth picture, rain water flowing under and seeping along the base of a recently-deposited volcanic ash layer has created the gully. For Mars, water is not actually seen but is inferred from the landforms and their similarity to examples on Earth.                        Mars Global Surveyor Image (June 2000) Earth (Mt. St. Helens)
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5 Sept 2003 Solar System - C.C.Lang 5 Geological Evidence: Sustained Water Flow
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5 Sept 2003 Solar System - C.C.Lang 6 MGS
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5 Sept 2003 Solar System - C.C.Lang 7 Geological Evidence: Possible Ancient Streambeds and Erosion Channels
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5 Sept 2003 Solar System - C.C.Lang 8 Summers in the Martian southern hemisphere are shorter than summers in the northern hemisphere. Why? (1) The northern hemisphere is chilled by a larger polar cap (2) There are more volcanoes in the southern hemisphere (3) The southern hemisphere is at much lower elevation on average the Martian equatorial bulge makes the sun shine more directly on the Southern hemisphere (4)This is a consequence of Mars’ elliptical orbit.
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5 Sept 2003 Solar System - C.C.Lang 9 The physics of finding water on Mars When/how does water (H 2 0) exist in its liquid state? LIQUID water exists over a very NARROW range in TEMPERATURE
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5sept03_notes - Water on Mars Geological Evidence for Water...

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