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Originally Posted by FieryIce
Mars observed in 1976 by the Viking Orbiter then observed again by Mars Odyssey mapping (2001-04)...Comparing these two images there are significant differences in the geology of Mars, 1976 compared to 2001-2004.
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I don't think so. The images themselves are different in quality, but the features look the same, especially from such high altitude.
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Originally Posted by FieryIce
Mariner 9 images from 1971 also show geological changes on Mars compared to the present Odyssey mapping images.
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There can be coloration differences due to the effect of dust storms. The canyons and craters are in the same places.
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Originally Posted by FieryIce
I found it amazing the changes in the geology of Mars...I remember all the speculation about the canals on Mars...Reading about them in science magazines and the science fiction books ...noted by many astronomers...
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"Many astronomers" are? You're probably thinking of
Percival Lowell.