e get about 500 kg of rocks from Mars every year, transferred by natural processes incapable of sterilizing them, and have been getting such rocks for the past 4 billion years. So if there are or ever were pathogens on the surface of Mars, they are already here.
There is much greater danger in digging a hole on Earth, thereby revealing sediments from the Earth's past (where there really were pathogens) than in retrieving material from Mars. In fact, there is no natural material to be found anywhere in Earth's environment that is not far more dangerous than any rock from Mars.
There is much greater danger in digging a hole on Earth, thereby revealing sediments from the Earth's past (where there really were pathogens) than in retrieving material from Mars. In fact, there is no natural material to be found anywhere in Earth's environment that is not far more dangerous than any rock from Mars.
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