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How could scientists affirm that a meteorite comes from Mars and not from another source ? This is a probability or an absolute certainty ? How much percent ?

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What do you mean by 'comes from Mars'? – Wouter Feb 7 at 13:21
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The question seems clear to me. Some meteorites found in Antarctica have been claimed to be from Mars, and Antonio is simply asking how we know this. Antonio, this isn't my area but a quick Google found meteorite.unm.edu/site_media/pdf/MarsMeteorites.pdf and this answers your question for at least one class of meteorites. – John Rennie Feb 7 at 14:42
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@JohnRennie Okay, that wasn't clear to me without any references since I didn't know about those meteorites. I guess it is clear to people who do know about them. Thanks for clearing it up. – Wouter Feb 7 at 18:52
@JohnRennie: Hmmm... Though this isn't your area, you're participating in the competition queue anyways..! :P – Ϛѓăʑɏ βµԂԃϔ Feb 8 at 13:00

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