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Interesting!
Apart from the contamination issue, I have some other questions. (Carl, please note: I'm not expecting you to answer them) ...
They say that the meteorites are Martian because the gases inside them match the Martian atmosphere. How do they know what the Martian atmosphere was like billions of years ago? They don't have core samples.
Presumably, a large body (asteroid) hit Mars and sent these smaller bodies into space, eventually landing on Earth as meteorites. How do we know that the meteorites did not originate from the impact body?
Regards, Rob.
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