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The
Real Surface of Mars
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Observed close up starting
in 1960s with Mariner 4,6,7
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Craters rediscovered
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Lots of craters
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Mars surface must be old
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more like the moon than the
Earth
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craters flat at the bottom
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Clouds on Mars (visible from
Earth)
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Dust storms probably fill
craters
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very fine dust
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3 billion years of dust storms
haven't completely filled them up
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More craters in the southern
hemisphere
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evidently more geologic activity
in northern hemisphere
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Guessing based on the moon,
Mercury, Venus, what geologic activity happened on Mars?
Viking image of dust
storm
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