But it was also full of hostile Pawnee, Lakota, Omaha, and Arapaho, not to mention a serious lack of convenience stores to replenish basic supplies.
And life is even less forgiving above 40,000'.............not to mention 230K miles away (our own moon). Mars? In 2003, it was at its closest to Earth for the past 60,000 years..........a mere 35 million miles away. Think about that for a while. First, 60K years ago, Neanderthals were running around the glaciers that covered the northern hemisphere. Secondly, timed right, the journey would take a full year at best, and that would only be possible every few years. Otherwise, it's a greater guarantee of a death sentence.
Sorry, but as a guy who spent a lifetime in a military/engineering environment, and who worked with guys who wore t-shirts that said, "Why Yes, As a Matter of Fact, I'm a Rocket Scientist", I'm pretty sure that space travel and colonization is science fiction. Militarized space? You bet. We're already there. Space mining? I doubt it........at least for a century or two, but maybe. Colonies of well-to-do-aristocrats toasting NASA with Space Champagne or huddled masses of illegal Honduran immigrants seeking good farmland?
Please............