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Originally Posted by Richard
I'm certainly no expert, but it seems to me that planets with atmospheres are fairly well protected against life-material contaminants on the outer surfaces of objects that enter. Those surfaces are going to get very hot.
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well yeah, but from launch time at earth to landing time on the other planet its often 1 or 2 years - sometimes much longer. Anything that contaminated the probe during launch has a long time to find its way inside the probe, where it will be protected, like the electronics and parachutes are protected.