Mars Atmosphere Mine

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Scientific Feasibility
I'?m under the impression that a successful manned mission to Mars will be measured by what can be sent back to earth. I think people will be very interested to see and touch objects from mars. I have designed a base that focuses on extracting and storing the necessary resources from the atmosphere for sustainable life and for propellant for return missions to earth.
I read a few articles about some possible executions for a mission to Mars, a