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I mean, I think one of those sounds a lot more interesting than the other. We pretty much know what's up with the bottom of the ocean. Human eyes have never seen most of the solar system. If I'm giving up my whole life to move somewhere, it's not gonna be the mariana trench.
What do you think we’ll learn from living on Mars that we can’t learn by sending probes? (Earnest question.)
A couple of things. For starters, all the mars rovers launched to date have surveyed less terrain than a determined hiker could knock out in a day. And if you get a weird result from an experiment (like the oxygen thing), it takes 10 years to send a new rover to do a follow-up.
A good human chemist with basic equipment could do literal centuries worth of probe science in a matter of weeks, and they could do it over a much wider range of locations. Probes are great at taking pictures from space, and kind of lousy at every other kind of science.
Imagine a European in 1600 asking that about going to America. No-one will ever live there because it’s inhospitable. What can we learn from going that we can’t learn by sending probes? America was similarly “inhospitable” if honestly compared to European cities of that time
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A THREAD ABOUT LIVING IN SPACE 
