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Lecture15_110f2007

Lecture15_110f2007 - Mars A Victim of Planetary...

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1 Mars: A Victim of Planetary Freeze-drying Mars versus Earth 50% Earth’s radius, 11% Earth’s mass. 1.5 AU from the Sun. Axis tilt about the same as Earth. Similar rotation period. Orbit is more elliptical than Earth’s: seasons more extreme in the south than in the north. Thin CO 2 atmosphere (<1% of atmospheric pressure on Earth): little greenhouse effect. Main difference seems to be: Mars is smaller than the Earth! What geological features tell us water once flowed on Mars? Surface of Mars appears to have ancient river beds Condition of craters indicates surface history Eroded crater
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2 Close-up of eroded crater Volcanoes…as recent as 180 million years ago… Past tectonic activity… Low-lying regions may once have had oceans… Opportunity Spirit
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3 • 2004 Opportunity Rover provided strong evidence for abundant liquid water on Mars in the distant past. • How could Mars have been warmer and wetter in the past?
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  • Fall '07
  • Roussev
  • liquid water, oxygen Plate tectonics, Atmospheric oxygen Plate, water Atmospheric oxygen, liquid water Atmospheric

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