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If microbial life is discovered on Mars, and it's found to have terrestrial DNA, how will we know WE took it there recently on the space probes, and it wasn't planted there ages earlier via panspermia(meteors from Earth etc)?

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If microbial life is discovered on Mars, and it's found to have terrestrial DNA, how will we know WE took it there recently on the space probes, and it wasn't planted there ages earlier via panspermia(meteors from Earth etc)?	1