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Originally Posted by blynk
Yes, but I don't think we are talking about todays technology. Within 10-20years, we could have that down to 100 years, and another 10-20 we could have that down to 3 years.
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I'm picturing a scenario in which the Earth faces some sort of existential external threat at a solar-system level - Melancholia-style wandering planet, for example - and it comes down to "we have to get a group of people and a whole bunch of genetic material not only off-planet but out of the solar system or everything on Earth is rendered extinct".
Those are the sorts of situations where I like to imagine the resources and brainpower of the Earth would come up with a get-us-to-Proxima-Centauri solution within years or decades.