My most unpopular opinions: 1) humans (as humans) will never have longterm space colonies 2) nationalism on the whole is a good thing.
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Give Heinlein some credit too here.
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I have a theory that Heinlein's turn away from hard science fiction post 1960 was due to realizing how limited real future will be.
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Huge challenge,but if our civiliz'n survives I think it'll happen Eventually
#SpaceElevator+similar tech chgs the equations -
Assuming it really worked, you'd have to have a reason to build it in the first place.
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