wichajster
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- Aug 22, 2017
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Yes, self-sustaining colonies outside Earth would reduce risk. But self-sustaining colonies are in the extreme future.Well the answer is still spread and breed. If planetary travel is too fast, easy and cheap, go interplanetary. If we somehow manage interplanetary mass tourism, go interstellar and keep going.
Note what kind of things you need to be self-sufficient! For example CPU foundry costs alone runs into billions (costs are not directly important, but it is good indication of complexity). See https://en.wikipedia.org/wiki/Semiconductor_fabrication_plant
"Colony on Moon/Mars" is borderline absurdity, "profitable human settlement" may be impossible. "truly independent colony" is lets say a questionable content.
And while extrasolar travel is technically achievable (see Orion drive), estimates go like "50% of global economic output, for centuries, for a single one-way mission to the nearest star"...