
Everyone is focusing on the journey. My first thought is how are they going to build a 36 mile long spaceship? Given how long it took to build the tiny ISS, it'll take 400 years to build something 10,000 times larger. That's not to mention the unforeseen technical issues, redesigns, cost overruns, geopolitical recalibrations, etc. All that time you're also having to defend the partially constructed spaceship from impacts. It would be way smarter to build 100 small ships and then those than put all your eggs in one basket on a single gigantic unbuildable project.
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