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Rationale for Colonization

I do not believe we should be making a single-focus effort to get people on Mars just for a jingoistic headline. If we are serious about colonizing space, it should be a step along the way, and not one of these steps should be taken without making a secure base and refueling station at each point along the way. Mind-map I wonder if anyone more expert can help me. Please tweet your reactions or any useful links. Tweet to @RichardFPenn

Can anyone shed any light? Tweet to the above address, or email me.

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