Quote:
Originally Posted by thrash
Do you have a cite for that? I just finished a graduate level class in meteorites, and ALH84001 has unequivocal Martian isotope ratios, not terrestrial. The 'fossils' are controversial, not the origin.
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I'm sure it didn't go from Earth to Mars and back (there's no real mechanic that would allow rocks to be ejected off of Earth), but you'll get a significant number of meteorites that have been colonized after landing.