![]() ![]() Some of the older landers have almost certainly taken Earth bacteria to Mars, since they were not purified before launch. ![]() Back in 1996, one Martian meteorite, ALH84001, was controversially thought to contain fossilised bacteria. ![]() This mode of interplanetary travel is important because it raises the possibility that life could inadvertently travel from one planet to another. A fragment of the NWA7397 meteorite, found in the Sahara desert in 2012.
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