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Let me ask you this: when you think about our future in 100-200 years, what do you see?

Do you really see us sitting around here and just being? Just stagnating? Waiting for the real-estate and resources to finally run out?

If you don't, or hope that it's not what all of this amounts to, the only question remaining should be "if not now, then when?".

Living in space or another planet requires the highest levels of sustainability. Necessity is the mother of invention. Everything learned in space will be used on Earth where applicable.

From a technology point of view, one of the collateral benefits of space exploration is that the technology and science that will come from that effort can be used elsewhere.