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spacex_fanny t1_j5p465b wrote

Yes, going ~850 km/s is not feasible today because we don't have torch drives like in The Expanse.

Torch drive / torchship is the generic term for the idea, an idea which has been used in various works of sci-fi. See more:

http://www.projectrho.com/public_html/rocket/torchships.php

https://www.orionsarm.com/eg-article/4df241e826b03

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