This feels very cynical, but what incentive does NASA have to do research showing alien life is not very likely in our solar system?
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I.e.: they don’t carry high power microscopes because apparently there’s no room for one on a 900kg rover the size of a car.
But no traces of life were found ever.
If there is life on Mars, it is hidden underground in vulcanic active areas and alike and no mission we can do today, could conclude with certainty that there is no life on Mars. But we have been looking real hard.