January 3, 200620 yr I'm sort of hoping this could be one of those impacts of the sort we've been waiting for in the geology community. Did you know that we actually have quite a few more meteorites from Mars than we do from the Moon? We have more moon rocks of course, thanks to the trips there, but every rock we get from a new location can tell us something new. Why do we have more from Mars? Well, the short answer is that there hasn't been a major impact on the moon recently enough to really kick off any debris. When rocks are kicked off of the moon, they come down on Earth pretty fast because of the distance and gravity. With Mars, its so much farther away that you sort of get an averaging of the rate of impacts, so you have a fairly constant flux, but with the moon, you get them in pulses every time there's an impact.
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