Quote:
Originally posted by Duane@Dec 26 2004, 02:31 PM
Such a large impact would leave many other signs, none of which exist on Mars.
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Perhaps so, but this really is a puzzle, since it seems pretty unlikely that Mars would have had heat from radio-isotope decay that only revealed itself as volcanos in one isolated part of the planet, that only appeared recently.
I make no claim that my model must be correct, but the model you describe has some big problems too.
Sadly, the Mars 2009 rovers aren't likely to measure anything that can tell us more.