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Jan 14, 2019 at 3:27 comment added Russell Borogove "Many novel launch schemes need some amount of help from rockets. What kills a lot of them is doing a tradeoff study of just enlarging the rocket part and getting rid of the non-rocket part. Surprisingly often, that works out to be better and cheaper." -- Henry Spencer
Jan 14, 2019 at 1:36 history answered Level River St CC BY-SA 4.0