Id say we have already started to contaminate other planets considering the amount of probes we have deliberately crashed onto other planets surface especially mars.
Im also wondering if we would ever go back to venus, i know the Russian probe that made it to the surface in the 70's only lasted minuets but if we could build something to over come the temprature and pressure thats on the surface maybe we could use that as a study for what could happen on earth with a run away green house effect.
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