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A comment on The Tyranny of the Rocket Equation (2012). Parent comment

Re:The Tyranny of the Rocket Equation (2012) by rkangel on Thursday October 31, 2019 @07:27AM (#21407567)
The most advanced project of this nature is Skylon and its Sabre engine (https://en.wikipedia.org/wiki/Skylon_(spacecraft)).
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