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It will take way longer than 100 years to gey an atmosphere ready to grow earth crops on Mars, if at all possible.
I know that, I was putting a random number. Regardless, we could still have a fleet of robots go build structures there, then another that will grow things in the structures... We talk about sending men to mars, but I think it's short-sighted to not first figure out how to send and deploy resources and robots to pre-build infrastructure for said humans - and we should be practicing on the moon. Or why is it that nobo…
As far as I know SpaceX is focusing on sending "stuff" to Mars, not just humans. Humans are better than robots in many ways though, as in they can do a lot of more versatile stuff. We can build rovers to explore and take pictures, but building a robot that can mimic the palette of actions of a typical human is far beyond our reach at the moment.