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The impracticability of a carbon nanotube space elevator

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I came by an interesting point on Reddit after reading about the Obayashi Corporation experimenting with ideas for a future space elevator. Apparently, the strength of Carbon nanotubes is cut in half with even a single atomic being out of place. Given that the tubes will be in a radiation intense environment, it would need shielding adding to more weight. 


Could something like Kevlar be used to make one?



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Kevlar would be sufficient on Mars, but not Earth. I think in general something like a StarTram is better logistically than a 30,000 kilometer pole.

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