It's not either / or. Regardless, it's a good example of the philosophical division between those who favor an inward focus (this is all there is, let's get really good at it) and those who look outward (this is just the start of an amazing journey).https://twitter.com/zeynep/status/1111619117876957184 …
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I don't get the limits of physics reference. Where does that come from? From everything I've seen (from the perspective of an astronautical engineer), it's doable. BTW: space habitats are >> colonization
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I had a prof at Berkeley with NASA funding to research using algae to convert CO2 to O2 in space. But he never did manage to make it viable. One little example of coming up against limits.
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Ah, yes. One cannot break through the heavenly spheres to reach the other worlds.
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