I get a really good chuckle seeing all of these: "humans are staying on earth" comments. Im sure the idea of crossing the Atlantic seemed impossible too....
And I don't know where such accurate figures of $12 trillion for a 30 man crew came from.... but shit I'd saying advancing humanity to a full blown interplanetary species is atleast as useful as nation building activities in the middle east. Elon and many other Billionaires are taking a serious interest in privatizing spaceflight IE MAKE A PROFIT OFF SPACE TRAVEL. To me that sounds way more hopeful than: "only the guberment is capable enough to get it done..."
Also Im pretty sure from the get go SLS block II had ideas of taking Orion capsules into a mars orbit.
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