Mars is a large world. It's not as big as earth, but there's also no oceans, so the exploitable land area is roughly the same. And it is pristine; no one has ev

Mars is a large world. It's not as big as earth, but there's also no oceans, so the exploitable land area is roughly the same. And it is pristine; no one has ever exploited any of it. With plenty of space and plenty of resources at hand, long term there's no reason a mars colony could not be self sustaining. Whether that could be true as early as 2050 would depend, of course!